Will the caves be like a dungeon with an entrance you can enter? Or more like a Dwarf Fortress kind of system? This whole thing is extremely impressive either way.
Procedural caves will be carved into the heightmap baseed on biomes, so more like how rimworld handles them. Structures like dungeon and cities will be placed according to the heightmap on different height levels, while handcrafted caves and dungeons will be accessed with a teleport in a separated map