I've been looking into custom world generation recently and I found out that you can create custom biomes and have them generate in the world. I was wondering if it was at all possible to use this to create a biome with no floor at all. Like just a hole that drops into the void. I know I could use custom worldgen settings to create floating islands, but then I couldn't have stuff like custom particles, fog, or water. I've tried using custom surface builders, but I don't think they're powerful enough.
Is it possible to have a custom biome override the world generation and just be a huge hole?