I want to modify existing/create new tiles and world-generated entities that drop quality items when mined, and it seems like ItemProductPrototype is the way to do that, but it doesn't allow specifying the quality.

I was thinking something like:
fixed_quality :: QualityID (optional)
on the ...

I'm trying to create an ore tile that produces ore with quality when mined, but not sure how to do that.

I found that the TilePrototype.mineable and EntityPrototype.mineable properties allow specifying a MineableProperties object, in which we can specify the results as an array of ...