This is Datapack enables Cave World generation with biomes and allows foliage, aquifers, and large ore veins to generate. Unfortunately, you cannot change the height at which most structures generate with a datapack, so most of them generate on the bedrock roof. You should still be able to do everything you normally could, but it will be a challenge to do so!
If you (for some reason) want all your dimensions to be the cave preset, check out the End Caves pack I have made.
If that mod changes the terrain, one of the mods will probably overwrite the other. If that mod adds biomes, its foliage will probably not generate underground. If you are motivated, you can look at my source code to see how I fixed this in vanilla, which will let you do the same for the mod's features. Some issues may need specific compatibility packs made, which I may make in the future.

Datapack that creates Cave Worlds, based on the old preset, featuring all biomes, ocean caves, and most structures.