Making Modded Ores Biome-Dependent

Hi! Coming from 1.12, I'm really new to datapacks and I'd like some assistance. I've had some success in creating biome-specific ore spawns in Vanilla through looking at different packs and understanding the structure, but I haven't been able to find any that I can use as a reference for this specific goal.
What I do (sort of understand):  That unlike mods like oretweaker, ores/biomes/modifications has to be made per-file as opposed to a unified document.
What I don't get: Where to place** configured/placed features **and biome folders in a scenario where an ore is in one mod, and the biome is in another.

I'll be using Silent Gems and Terralith as an example.

Q. How does the folder structure work if I wanted to make "Topaz Ore" only spawn in Terralith's Yellowstone Biome? 
Edit: I deleted a part of the post since I realized that it could possibly be in either biome or forge/biome_modifiers, and I'm still kind of stuck.