Other than the Beta world gen type of mods (providing alpha, beta, indev, infdev, I'm sure not if they add pre-1.7 world gen though) I don't think so. Not sure if buffet world gen allows for it to be possible either.
There may be mods out there I just can't think of any off the top of my head.
Rollback Post to RevisionRollBack
Niche Community Content Finder, Youtuber, Modpack/Map Maker, Duck
Forum Thread Maintainer for APortingCore, Liteloader Download HUB, Asphodel Meadows, Fabric Project, Legacy Fabric/Cursed Fabric, Power API, Rift/Fabric/Forge 1.13 to 1.17.