Is it possible to connect Joints with Bones? (detailed explanation in desc)

Basically, I have a character that is entirely rigged from Blender that is imported to Studio.
I’ve realized in the animation that simply adding Joints of this character’s face does not work as it doesn’t follow the face if I move either the head or the body that moves the character all together with the face included.

hu2ranimationds

(for some reason I just noticed there are transparent boxes that either hold the faces all together or either simply don’t and just are random boxes)

I’d appreciate the help as I wanted to make it that the character could have idle expressions in the animation.

The idea was to make the faces connected with Joints and follow the head until I’ve realized that it’s not that easy as apparently the faces don’t follow the face regardless where the bone moves.