The normal.json file in the vanilla worldgen files uses "preset": "minecraft:overworld"
There is no way to know what this preset is, or edit it, even though it is multinoise, making it impossible to edit vanilla biome placement.
it was possible to edit vanilla biome placement in 1.18 by editing the overworld dimension file
vanilla worldgen:
https://github.com/slicedlime/examples/blob/master/vanilla_worldgen.zip
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But you can't for example, remove plains biomes from the overworld and keep everything else the same, something you could do in 1.18.2. you would have to completely remake the 1.19 overworld biomes preset (which is unknown) but without plains biomes.
Works as intended. The biome parameters are now exported to generated/reports/biome_parameters with the data generators. See mcdata for example.
Also see this tweet by slicedlime
Note that the vanilla dimensions have been removed as we prepare for a larger change in how this data is handled.
You can still overwrite the overworld dimension file and modify it; the biome preset is just updated when new biomes are added in vanilla so pack makers can use that too.