Yep. That's how FTB handles their ore generation.
Edit: Here's a guide on how to setup ore generation and a bunch of other stuff with it.
I do have a question though. I'm assuming that when dealing with ore generation it just looks in that directory and pulls all jsons right? So if I want to organize multiple jsons it by world, or by mod or whatever I could? There's no call to a specific filename or anything I guess I'm asking.