Based on the wiki, it seems the mod currently supports loading condensed entries in datapack format, but not from a datapack. I tried copying and pasting the examples from the wiki into a properly structured datapack just to make sure, and it didn't load.

Personally I would find it really useful to be able to load condensed entries from datapacks, just because of how my workflow is structured. Is this possible?

Should have phrased such as ResourcePack and not datapack. It is a client-side-only mod meaning that it's loaded thru a resource pack instead due to such.

Edit: I don't see any reason to support datapack format due to this being a primarily clientside mod and only cosmetically effects the creative tab.

Ohh okay thanks!

Just to clarify, I can load in my own condensed entries from a resource pack with the mod as it is right now? Under assets/<mod id>/condensed_entries?

Yep