Using modified vanilla data on a custom world type/preset?

I have a slightly edited datapack from someone that changes vanilla worldgen to be superflat-esque while keeping caves and features, I was wondering if it is possible to keep all of this modified data but only applied to a specific custom world type? Looking at world type wiki I can only find basic things like dimension or biomes, would I have to copy all of this data to be new unique biomes only in this world type or make a whole new dimension for it?