Structures in dimension (but both custom)

How would i make a custom structure only spawn in a custom dimension i made. And more difficultly, it's a custom structure to a custom dimension with only vanilla biomes, so i cant just define it by  biomes. I already made the dimension and the structure, the dimension works and the structure works but I don’t know how to put it in the custom dimension only and not the overworld since they both use the same biomes, although if any group of elite datapack makers can do it, my guess is it’s you guys who can :)