diff --git a/NEWS.md b/NEWS.md
index bd95835..30b605b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -2,6 +2,7 @@
 
 * Use options to set `schema_version` and `branch` arguments in `download_tasks_schema()` and the `create_*()` family of functions for creating config files programmatically. This allows for setting the schema version and branch globally for the session (#85).
 * Make validation of `round_id` patterns explicit. This ties in with schema version v4.0.1 where the pattern the `round_id` property must match if `round_id_from_variable` is `false` is now specified as a regular expression in the schema. This check is also now implemented dynamically on values of the `round_id` variable if `round_id_from_variable` is `true` when validating tasks.json config files. Checks on `round_id` patterns are also now implemented in `create_round()` when creating rounds programmatically.
+* As of schema version v5.0.0, only a single `target_keys` element is allowed when creating target metadata items programmatically (#89).
 
 # hubAdmin 1.4.0
 
diff --git a/R/create_target_metadata_item.R b/R/create_target_metadata_item.R
index 9e2e290..ade3d03 100644
--- a/R/create_target_metadata_item.R
+++ b/R/create_target_metadata_item.R
@@ -11,13 +11,15 @@
 #' @param target_name character string. A longer human readable target description
 #' that could be used, for example, as a visualisation axis label.
 #' @param target_units character string. Unit of observation of the target.
-#' @param target_keys named list or `NULL`. Should be `NULL`, in the case
-#' where the target is not specified as a task_id but is specified solely through
-#' the `target_id` argument. Otherwise, should be a named list of one or more
-#' character strings. The name of each element should match a task_id variable
-#' within the same model_tasks object. Each element should be of length 1.
-#' Each value, or the combination of values if multiple keys are specified,
-#' define a single target value.
+#' @param target_keys named list or `NULL`. The `target_keys` value defines a
+#' single target.
+#' Should be a named list containing a single character string element.
+#' The name of the element should match a `task_id` variable name within the same
+#' `model_tasks` object and the value should match a single value of that variable
+#' as described in
+#' [target metadata section of the official hubverse documentation](https://hubverse.io/en/latest/user-guide/tasks.html#target-metadata). # nolint: line_length_linter
+#' Otherwise, `NULL` in the case where the target is not specified as a task_id
+#' but is specified solely through the `target_id` argument.
 #' @param description character string (optional). An optional verbose description
 #' of the target that might include information such as definitions of a 'rate' or similar.
 #' @param target_type character string. Target statistical data type. Consult the
@@ -117,7 +119,10 @@ create_target_metadata_item <- function(target_id, target_name, target_units,
     }
   )
 
-  check_target_keys(target_keys, call = call)
+  check_target_keys(target_keys,
+    schema_version = schema$`$id`,
+    call = call
+  )
 
   structure(mget(property_names),
     class = c("target_metadata_item", "list"),
@@ -127,7 +132,8 @@ create_target_metadata_item <- function(target_id, target_name, target_units,
   )
 }
 
-check_target_keys <- function(target_keys, call = rlang::caller_env()) {
+check_target_keys <- function(target_keys, schema_version,
+                              call = rlang::caller_env()) {
   if (is.null(target_keys)) {
     return()
   }
@@ -149,6 +155,20 @@ check_target_keys <- function(target_keys, call = rlang::caller_env()) {
       call = call
     )
   }
+  is_gte_v5_0_0 <- hubUtils::version_gte(
+    "v5.0.0",
+    schema_version = schema_version
+  )
+  target_key_n <- length(target_keys)
+  if (is_gte_v5_0_0 && target_key_n > 1L) {
+    cli::cli_abort(
+      c(
+        "!" = "{.arg target_keys} must be a named {.cls list} of
+        length {.val {1L}} not {.val {target_key_n}}."
+      ),
+      call = call
+    )
+  }
 
   purrr::walk2(
     target_keys,
diff --git a/hubAdmin.Rproj b/hubAdmin.Rproj
index 97b9e3f..a7bcba2 100644
--- a/hubAdmin.Rproj
+++ b/hubAdmin.Rproj
@@ -1,4 +1,5 @@
 Version: 1.0
+ProjectId: a853e49a-e7e8-463b-96b8-8c69e98c0382
 
 RestoreWorkspace: No
 SaveWorkspace: No
diff --git a/man/create_target_metadata_item.Rd b/man/create_target_metadata_item.Rd
index 97e2387..cd21ee5 100644
--- a/man/create_target_metadata_item.Rd
+++ b/man/create_target_metadata_item.Rd
@@ -26,13 +26,15 @@ that could be used, for example, as a visualisation axis label.}
 
 \item{target_units}{character string. Unit of observation of the target.}
 
-\item{target_keys}{named list or \code{NULL}. Should be \code{NULL}, in the case
-where the target is not specified as a task_id but is specified solely through
-the \code{target_id} argument. Otherwise, should be a named list of one or more
-character strings. The name of each element should match a task_id variable
-within the same model_tasks object. Each element should be of length 1.
-Each value, or the combination of values if multiple keys are specified,
-define a single target value.}
+\item{target_keys}{named list or \code{NULL}. The \code{target_keys} value defines a
+single target.
+Should be a named list containing a single character string element.
+The name of the element should match a \code{task_id} variable name within the same
+\code{model_tasks} object and the value should match a single value of that variable
+as described in
+\href{https://hubverse.io/en/latest/user-guide/tasks.html#target-metadata}{target metadata section of the official hubverse documentation}. # nolint: line_length_linter
+Otherwise, \code{NULL} in the case where the target is not specified as a task_id
+but is specified solely through the \code{target_id} argument.}
 
 \item{description}{character string (optional). An optional verbose description
 of the target that might include information such as definitions of a 'rate' or similar.}
diff --git a/tests/testthat/_snaps/create_target_metadata_item.md b/tests/testthat/_snaps/create_target_metadata_item.md
index 2cae71e..859795b 100644
--- a/tests/testthat/_snaps/create_target_metadata_item.md
+++ b/tests/testthat/_snaps/create_target_metadata_item.md
@@ -162,3 +162,14 @@
       - "https://raw.githubusercontent.com/hubverse-org/schemas/main/v3.0.1/tasks-schema.json"
       + "https://raw.githubusercontent.com/hubverse-org/schemas/main/v4.0.0/tasks-schema.json"
 
+# Target_keys of length more than 1 are not allowed post v5.0.0
+
+    Code
+      create_target_metadata_item(target_id = "flu inc hosp", target_name = "Weekly incident influenza hospitalizations",
+        target_units = "rate per 100,000 population", target_keys = list(target = "flu",
+          target_metric = "inc hosp"), target_type = "discrete", is_step_ahead = TRUE,
+        time_unit = "week")
+    Condition
+      Error in `create_target_metadata_item()`:
+      ! `target_keys` must be a named <list> of length 1 not 2.
+
diff --git a/tests/testthat/test-create_output_type_item.R b/tests/testthat/test-create_output_type_item.R
index c26ba49..7c17214 100644
--- a/tests/testthat/test-create_output_type_item.R
+++ b/tests/testthat/test-create_output_type_item.R
@@ -452,7 +452,7 @@ test_that("schema version option works for create_output_type_mean", {
   withr::with_options(
     list(
       hubAdmin.schema_version = "v3.0.1",
-      hubAmin.branch = "main"
+      hubAdmin.branch = "main"
     ),
     {
       opt_version <- create_output_type_mean(
@@ -493,7 +493,7 @@ test_that("schema version option works for create_output_type_quantile", {
   withr::with_options(
     list(
       hubAdmin.schema_version = "v3.0.1",
-      hubAmin.branch = "main"
+      hubAdmin.branch = "main"
     ),
     {
       opt_version <- create_output_type_quantile(
@@ -543,7 +543,7 @@ test_that("schema version option works for create_output_type_cdf", {
   withr::with_options(
     list(
       hubAdmin.schema_version = "v3.0.1",
-      hubAmin.branch = "main"
+      hubAdmin.branch = "main"
     ),
     {
       opt_version <- create_output_type_cdf(
@@ -590,7 +590,7 @@ test_that("schema version option works for create_output_type_pmf", {
   withr::with_options(
     list(
       hubAdmin.schema_version = "v3.0.1",
-      hubAmin.branch = "main"
+      hubAdmin.branch = "main"
     ),
     {
       opt_version <- create_output_type_pmf(
diff --git a/tests/testthat/test-create_round.R b/tests/testthat/test-create_round.R
index 30ce7e1..a4a6f1a 100644
--- a/tests/testthat/test-create_round.R
+++ b/tests/testthat/test-create_round.R
@@ -229,8 +229,8 @@ test_that("validating round_id patterns when round_id_from_var = TRUE works", {
   skip_if_offline()
   withr::with_options(
     list(
-      hubAdmin.schema_version = "v4.0.1",
-      hubAdmin.branch = "br-v4.0.1"
+      hubAdmin.schema_version = "v5.0.0",
+      hubAdmin.branch = "br-v5.0.0"
     ),
     {
       output_types <- create_output_type(
@@ -372,8 +372,8 @@ test_that("validating round_id pattern when round_id_from_var = FALSE works", {
   skip_if_offline()
   withr::with_options(
     list(
-      hubAdmin.schema_version = "v4.0.1",
-      hubAdmin.branch = "br-v4.0.1"
+      hubAdmin.schema_version = "v5.0.0",
+      hubAdmin.branch = "br-v5.0.0"
     ),
     {
       output_types <- create_output_type(
diff --git a/tests/testthat/test-create_target_metadata_item.R b/tests/testthat/test-create_target_metadata_item.R
index 8231cbb..e91768b 100644
--- a/tests/testthat/test-create_target_metadata_item.R
+++ b/tests/testthat/test-create_target_metadata_item.R
@@ -131,7 +131,7 @@ test_that("schema version option works for create_target_metadata_item", {
   withr::with_options(
     list(
       hubAdmin.schema_version = "v3.0.1",
-      hubAmin.branch = "main"
+      hubAdmin.branch = "main"
     ),
     {
       opt_version <- create_target_metadata_item(
@@ -148,3 +148,69 @@ test_that("schema version option works for create_target_metadata_item", {
   expect_equal(arg_version, opt_version)
   expect_snapshot(waldo::compare(opt_version, version_default))
 })
+
+test_that("Target_keys of length more than 1 are not allowed post v5.0.0", {
+  skip_if_offline()
+  withr::with_options(
+    list(
+      hubAdmin.schema_version = "v5.0.0",
+      # TDOD: remove branch argument when v5.0.0 is released.
+      hubAdmin.branch = "br-v5.0.0"
+    ),
+    {
+      # One target_key is allowed in v5.0.0 and later versions.
+      target_keys_n1 <- create_target_metadata_item(
+        target_id = "inc hosp",
+        target_name = "Weekly incident influenza hospitalizations",
+        target_units = "rate per 100,000 population",
+        target_keys = list(target = "inc hosp"),
+        target_type = "discrete",
+        is_step_ahead = TRUE,
+        time_unit = "week"
+      )
+      expect_s3_class(target_keys_n1, "target_metadata_item")
+      expect_length(target_keys_n1$target_keys, 1L)
+
+      # More than one target_key is NOT allowed in v5.0.0 and later versions
+      # and throws error.
+      expect_snapshot(
+        create_target_metadata_item(
+          target_id = "flu inc hosp",
+          target_name = "Weekly incident influenza hospitalizations",
+          target_units = "rate per 100,000 population",
+          target_keys = list(
+            target = "flu",
+            target_metric = "inc hosp"
+          ),
+          target_type = "discrete",
+          is_step_ahead = TRUE,
+          time_unit = "week"
+        ),
+        error = TRUE
+      )
+    }
+  )
+  # More than 1 target_keys still allowed in earlier versions to conform to
+  # schema.
+  withr::with_options(
+    list(
+      hubAdmin.schema_version = "v4.0.0"
+    ),
+    {
+      target_keys_n2 <- create_target_metadata_item(
+        target_id = "flu inc hosp",
+        target_name = "Weekly incident influenza hospitalizations",
+        target_units = "rate per 100,000 population",
+        target_keys = list(
+          target = "flu",
+          target_metric = "inc hosp"
+        ),
+        target_type = "discrete",
+        is_step_ahead = TRUE,
+        time_unit = "week"
+      )
+      expect_s3_class(target_keys_n2, "target_metadata_item")
+      expect_length(target_keys_n2$target_keys, 2L)
+    }
+  )
+})
diff --git a/tests/testthat/test-create_task_id.R b/tests/testthat/test-create_task_id.R
index 044cef8..a85eb52 100644
--- a/tests/testthat/test-create_task_id.R
+++ b/tests/testthat/test-create_task_id.R
@@ -114,7 +114,7 @@ test_that("schema version option works for create_task_id", {
   withr::with_options(
     list(
       hubAdmin.schema_version = "v3.0.1",
-      hubAmin.branch = "main"
+      hubAdmin.branch = "main"
     ),
     {
       opt_version <- create_task_id("horizon",
diff --git a/tests/testthat/test-download_tasks_schema.R b/tests/testthat/test-download_tasks_schema.R
index 236d6fd..0e2dd30 100644
--- a/tests/testthat/test-download_tasks_schema.R
+++ b/tests/testthat/test-download_tasks_schema.R
@@ -40,7 +40,7 @@ test_that("schema version option works for download_tasks_schema", {
 
   withr::with_options(
     list(hubAdmin.schema_version = "v3.0.1",
-         hubAmin.branch = "main"),
+         hubAdmin.branch = "main"),
     {
       opt_version <- download_tasks_schema()
     }
diff --git a/tests/testthat/test-validate_config.R b/tests/testthat/test-validate_config.R
index 760beec..95935b5 100644
--- a/tests/testthat/test-validate_config.R
+++ b/tests/testthat/test-validate_config.R
@@ -252,10 +252,43 @@ test_that("v4 validation works", {
   )
 })
 
-test_that("v4.0.1 round_id pattern validation works", {
+
+test_that("v5.0.0 target keys with 2 properties throws error", {
+  skip_if_offline()
+  config_path <- testthat::test_path("testdata", "v5.0.0-tasks-2-target_keys.json")
+  out <- suppressMessages(
+    validate_config(
+      config_path = config_path,
+      # TDOD: remove branch argument when v5.0.0 is released.
+      branch = "br-v5.0.0"
+    )
+  )
+  expect_false(out)
+
+  expect_equal(
+    unique(attr(out, "errors")$message),
+    "must NOT have more than 1 items"
+  )
+  expect_equal(nrow(attr(out, "errors")), 2L)
+})
+
+test_that("v5.0.0 target keys with NULL properties passes", {
+  # Ensure NULL target keys are still allowed.
+  config_path <- testthat::test_path("testdata", "v5.0.0-tasks-null-target_keys.json")
+  out <- suppressMessages(
+    validate_config(
+      config_path = config_path,
+      # TDOD: remove branch argument when v5.0.0 is released.
+      branch = "br-v5.0.0"
+    )
+  )
+  expect_true(out)
+})
+
+test_that("v5.0.0 round_id pattern validation works", {
   skip_if_offline()
-  # TODO: remove branch argument when v4.0.1 is released.
-  schema <- download_tasks_schema("v4.0.1", branch = "br-v4.0.1")
+  # TODO: remove branch argument when v5.0.0 is released.
+  schema <- download_tasks_schema("v5.0.0", branch = "br-v5.0.0")
 
   # Test that regex pattern matching for round_id properties in jsonvalidate
   # identifies expected errors (when round_id_from_variable: false).
@@ -264,9 +297,9 @@ test_that("v4.0.1 round_id pattern validation works", {
       validate_config(
         config_path = testthat::test_path(
           "testdata",
-          "v4.0.1-tasks-fail-round-id-pattern.json"
+          "v5.0.0-tasks-fail-round-id-pattern.json"
         ),
-        branch = "br-v4.0.1"
+        branch = "br-v5.0.0"
       )
     )
   )
@@ -292,9 +325,9 @@ test_that("v4.0.1 round_id pattern validation works", {
       validate_config(
         config_path = testthat::test_path(
           "testdata",
-          "v4.0.1-tasks-fail-round-id-val-pattern.json"
+          "v5.0.0-tasks-fail-round-id-val-pattern.json"
         ),
-        branch = "br-v4.0.1"
+        branch = "br-v5.0.0"
       )
     )
   )
diff --git a/tests/testthat/testdata/v5.0.0-tasks-2-target_keys.json b/tests/testthat/testdata/v5.0.0-tasks-2-target_keys.json
new file mode 100644
index 0000000..182014c
--- /dev/null
+++ b/tests/testthat/testdata/v5.0.0-tasks-2-target_keys.json
@@ -0,0 +1,164 @@
+{
+    "schema_version": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v5.0.0/tasks-schema.json",
+    "rounds": [{
+            "round_id_from_variable": true,
+            "round_id": "forecast_date",
+            "model_tasks": [{
+                "task_ids": {
+                    "forecast_date": {
+                        "required": null,
+                        "optional": [
+                            "2022-12-12", "2022-12-19", "2022-12-26", "2023-01-02", "2023-01-09",
+                            "2023-01-16", "2023-01-23", "2023-01-30", "2023-02-06", "2023-02-13",
+                            "2023-02-20", "2023-02-27", "2023-03-06", "2023-03-13", "2023-03-20",
+                            "2023-03-27", "2023-04-03", "2023-04-10", "2023-04-17", "2023-04-24",
+                            "2023-05-01"
+                        ]
+                    },
+                    "target": {
+                        "required": null,
+                        "optional": ["wk ahead inc"]
+                    },
+                    "target_metric": {
+                        "required": null,
+                        "optional": ["flu hosp"]
+                    },
+                    "horizon": {
+                        "required": [2],
+                        "optional": [1]
+                    },
+                    "location": {
+                        "required": ["US"],
+                        "optional": [
+                            "01",
+                            "02"
+                        ]
+                    },
+                    "target_date": {
+                        "required": null,
+                        "optional": [
+                            "2022-12-19", "2022-12-26", "2023-01-02", "2023-01-09",
+                            "2023-01-16", "2023-01-23", "2023-01-30", "2023-02-06", "2023-02-13",
+                            "2023-02-20", "2023-02-27", "2023-03-06", "2023-03-13", "2023-03-20",
+                            "2023-03-27", "2023-04-03", "2023-04-10", "2023-04-17", "2023-04-24",
+                            "2023-05-01", "2023-05-08", "2023-05-15"
+                        ]
+                    }
+                },
+                "output_type": {
+                    "sample": {
+                        "output_type_id_params": {
+                            "type": "character",
+                            "min_samples_per_task": 50,
+                            "max_samples_per_task": 100,
+                            "max_length": 10
+                        },
+                        "is_required": true,
+                        "value": {
+                            "type": "integer",
+                            "minimum": 0
+                        }
+                    },
+                    "mean": {
+                        "output_type_id": {
+                            "required": null
+                        },
+                        "is_required": true,
+                        "value": {
+                            "type": "double",
+                            "minimum": 0
+                        }
+                    }
+                },
+                "target_metadata": [{
+                    "target_id": "wk ahead inc flu hosp",
+                    "target_name": "weekly influenza hospitalization incidence",
+                    "target_units": "rate per 100,000 population",
+                    "target_keys": {
+                        "target": "wk ahead inc",
+                        "target_metric": "flu hosp"
+                    },
+                    "target_type": "discrete",
+                    "description": "This target represents the counts of new hospitalizations per horizon week.",
+                    "is_step_ahead": true,
+                    "time_unit": "week"
+                }]
+            }, {
+                "task_ids": {
+                    "forecast_date": {
+                        "required": null,
+                        "optional": [
+                            "2022-12-12", "2022-12-19", "2022-12-26", "2023-01-02", "2023-01-09",
+                            "2023-01-16", "2023-01-23", "2023-01-30", "2023-02-06", "2023-02-13",
+                            "2023-02-20", "2023-02-27", "2023-03-06", "2023-03-13", "2023-03-20",
+                            "2023-03-27", "2023-04-03", "2023-04-10", "2023-04-17", "2023-04-24",
+                            "2023-05-01"
+                        ]
+                    },
+                    "target": {
+                        "required": null,
+                        "optional": ["wk flu hosp"]
+                    },
+                    "target_metric": {
+                        "required": null,
+                        "optional": ["rate change"]
+                    },
+                    "horizon": {
+                        "required": [2],
+                        "optional": [1]
+                    },
+                    "location": {
+                        "required": ["US"],
+                        "optional": [
+                            "01",
+                            "02"
+                        ]
+                    },
+                    "target_date": {
+                        "required": null,
+                        "optional": [
+                            "2022-12-19", "2022-12-26", "2023-01-02", "2023-01-09",
+                            "2023-01-16", "2023-01-23", "2023-01-30", "2023-02-06", "2023-02-13",
+                            "2023-02-20", "2023-02-27", "2023-03-06", "2023-03-13", "2023-03-20",
+                            "2023-03-27", "2023-04-03", "2023-04-10", "2023-04-17", "2023-04-24",
+                            "2023-05-01", "2023-05-08", "2023-05-15"
+                        ]
+                    }
+                },
+                "output_type": {
+                    "pmf": {
+                        "output_type_id": {
+                            "required": ["large_decrease", "decrease", "stable", "increase", "large_increase"]
+                        },
+                        "is_required": false,
+                        "value": {
+                            "type": "double",
+                            "minimum": 0,
+                            "maximum": 1
+                        }
+                    }
+                },
+                "target_metadata": [{
+                    "target_id": "wk flu hosp rate change",
+                    "target_name": "weekly influenza hospitalization rate change",
+                    "target_units": "rate per 100,000 population",
+                    "target_keys": {
+                        "target": "wk flu hosp",
+                        "target_metric": "rate change"
+                    },
+                    "target_type": "nominal",
+                    "description": "This target represents the change in the rate of new hospitalizations per week comparing the week ending two days prior to the forecast_date to the week ending h weeks after the forecast_date.",
+                    "is_step_ahead": true,
+                    "time_unit": "week"
+                }]
+            }],
+            "submissions_due": {
+                "relative_to": "forecast_date",
+                "start": -6,
+                "end": 2
+            },
+            "derived_task_ids": ["target_date"]
+        }
+
+    ]
+}
diff --git a/tests/testthat/testdata/v4.0.1-tasks-fail-round-id-pattern.json b/tests/testthat/testdata/v5.0.0-tasks-fail-round-id-pattern.json
similarity index 99%
rename from tests/testthat/testdata/v4.0.1-tasks-fail-round-id-pattern.json
rename to tests/testthat/testdata/v5.0.0-tasks-fail-round-id-pattern.json
index 0813782..24517c0 100644
--- a/tests/testthat/testdata/v4.0.1-tasks-fail-round-id-pattern.json
+++ b/tests/testthat/testdata/v5.0.0-tasks-fail-round-id-pattern.json
@@ -1,5 +1,5 @@
 {
-    "schema_version": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v4.0.1/tasks-schema.json",
+    "schema_version": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v5.0.0/tasks-schema.json",
     "rounds": [{
             "round_id_from_variable": true,
             "round_id": "round_id_var",
diff --git a/tests/testthat/testdata/v4.0.1-tasks-fail-round-id-val-pattern.json b/tests/testthat/testdata/v5.0.0-tasks-fail-round-id-val-pattern.json
similarity index 99%
rename from tests/testthat/testdata/v4.0.1-tasks-fail-round-id-val-pattern.json
rename to tests/testthat/testdata/v5.0.0-tasks-fail-round-id-val-pattern.json
index ebcfd66..09a4217 100644
--- a/tests/testthat/testdata/v4.0.1-tasks-fail-round-id-val-pattern.json
+++ b/tests/testthat/testdata/v5.0.0-tasks-fail-round-id-val-pattern.json
@@ -1,5 +1,5 @@
 {
-    "schema_version": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v4.0.1/tasks-schema.json",
+    "schema_version": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v5.0.0/tasks-schema.json",
     "rounds": [{
             "round_id_from_variable": true,
             "round_id": "round_id_var",
diff --git a/tests/testthat/testdata/v5.0.0-tasks-null-target_keys.json b/tests/testthat/testdata/v5.0.0-tasks-null-target_keys.json
new file mode 100644
index 0000000..5dc10d0
--- /dev/null
+++ b/tests/testthat/testdata/v5.0.0-tasks-null-target_keys.json
@@ -0,0 +1,93 @@
+{
+    "schema_version": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v5.0.0/tasks-schema.json",
+    "rounds": [{
+            "round_id_from_variable": true,
+            "round_id": "forecast_date",
+            "model_tasks": [{
+                "task_ids": {
+                    "forecast_date": {
+                        "required": null,
+                        "optional": [
+                            "2022-12-12", "2022-12-19", "2022-12-26", "2023-01-02", "2023-01-09",
+                            "2023-01-16", "2023-01-23", "2023-01-30", "2023-02-06", "2023-02-13",
+                            "2023-02-20", "2023-02-27", "2023-03-06", "2023-03-13", "2023-03-20",
+                            "2023-03-27", "2023-04-03", "2023-04-10", "2023-04-17", "2023-04-24",
+                            "2023-05-01"
+                        ]
+                    },
+                    "target": {
+                        "required": null,
+                        "optional": ["wk ahead inc"]
+                    },
+                    "target_metric": {
+                        "required": null,
+                        "optional": ["flu hosp"]
+                    },
+                    "horizon": {
+                        "required": [2],
+                        "optional": [1]
+                    },
+                    "location": {
+                        "required": ["US"],
+                        "optional": [
+                            "01",
+                            "02"
+                        ]
+                    },
+                    "target_date": {
+                        "required": null,
+                        "optional": [
+                            "2022-12-19", "2022-12-26", "2023-01-02", "2023-01-09",
+                            "2023-01-16", "2023-01-23", "2023-01-30", "2023-02-06", "2023-02-13",
+                            "2023-02-20", "2023-02-27", "2023-03-06", "2023-03-13", "2023-03-20",
+                            "2023-03-27", "2023-04-03", "2023-04-10", "2023-04-17", "2023-04-24",
+                            "2023-05-01", "2023-05-08", "2023-05-15"
+                        ]
+                    }
+                },
+                "output_type": {
+                    "sample": {
+                        "output_type_id_params": {
+                            "type": "character",
+                            "min_samples_per_task": 50,
+                            "max_samples_per_task": 100,
+                            "max_length": 10
+                        },
+                        "is_required": true,
+                        "value": {
+                            "type": "integer",
+                            "minimum": 0
+                        }
+                    },
+                    "mean": {
+                        "output_type_id": {
+                            "required": null
+                        },
+                        "is_required": true,
+                        "value": {
+                            "type": "double",
+                            "minimum": 0
+                        }
+                    }
+                },
+                "target_metadata": [{
+                    "target_id": "wk ahead inc flu hosp",
+                    "target_name": "weekly influenza hospitalization incidence",
+                    "target_units": "rate per 100,000 population",
+                    "target_keys": null,
+                    "target_type": "discrete",
+                    "description": "This target represents the counts of new hospitalizations per horizon week.",
+                    "is_step_ahead": true,
+                    "time_unit": "week"
+                }]
+            }],
+            "submissions_due": {
+                "relative_to": "forecast_date",
+                "start": -6,
+                "end": 2
+            },
+            "derived_task_ids": ["target_date"]
+        }
+
+    ]
+}