Is there a way to import 3D, looping, CGi animations from blender into Unity?

Hello! I have two questions.

1. If I make a looping 3D animation, such as satisfying CGi, in blender, is there a way to import this into Unity?

2. If I am able to import the satisfying CGi, is there a way I can I add things such as box colliders to certain objects in the satisfying CGi I have made?

To further elaborate, if my satisfying CGi (made in blender, imported into Unity) has a bunch of spheres in it, will I be able to add a box collider on each one of those spheres?

Sorry if this is a confusing question.