Asset processing pipeline?

[feelingsonice]

I need to process my assets and have a sort of pipeline where I arrive at a final stage from some initial config files, an example of this is:

1. Read a RON config. The config includes paths for some Aseprite file.
2. Read the Aseprite files told by the RON config from above.
3. Process the Aseprites into TextureAtlases.

The final stage should allow me to access all three assets, the RON, the Aseprte, and the TextureAtlases. Right now I'm using bevy_asset_loader but it does not allow for any pipelined processing like mentioned above. This, I gauge, is a common use case.

Ofc, the idiomatic approach is to add a state for each of the stages and manually process them, which is what I'm doing, but for more complicated games this could easily get out of hand. Wondering if there's any better advice out there?