How to add animation to Bone, which is not displayed ?

The fact is that I automatically placed all the animations there as it should, but the problem is that the bone does not appear on the minimap, let's say a skirt or chest (shown in the screenshot) that is missing on the minimap, but there is a bone. I do not know how to add animation there. Help me please.

P.S. I began to work as a program 3 days ago, and I apologize if this is a very stupid question, but I would like to learn a lot.