How can I attach a Collider to a Joint in an imported rig?

Hello community.
I have been searching through the tutorials and answers for awhile but can’t find the answer.

My situation is I have an animated Enemy, and I need the Collider to follow the head of the character for rigidbody and trigger purposes.

I saw one video in which the user accessed the individual joints in the GameObject through the hierarchy and was able to attach a collider to whichever joint he needed.

However, I need to be able to do this in prefab, because I need to Instantiate from the assets rather than the hierarchy. I can’t find any way to access the imported joints from the assets and attach the collider there.

If anyone has a better method, I’m all ears.

summary: want to add a collider to imported joints but can only see them in hierarchy and not in assets.

Thanks!

Put the prefab in the scene hierachy, do the changes you need, select the root obj, press apply on the inspector?