Could you add Biome Whitelist entries for the Runewood Trees and the Soulstone ore?

I would like to isolate these 2 amazing features to specific biomes in order to create greater excitement around their discovery within my specific modpack that I am developing.

Yeah- biome tags work like any other tag I believe, you may simply add a file to your tags location titled 'runewood_tree_biome' and add some biome ids in there and bam, runewood trees spawn there.

Yes! I'll be adding this soon in form of biome tags.
1.18.2 introduced tags for every single registry type. Biomes, features, items, blocks, mobs, etc. Rather than just items & blocks.
There will be a tag that you can edit with json, which determines what biomes can support a given feature.

Woot exciting! Will this be in the form of a datapack then?