Working with OpenXR and Meta all-in-one SDK --> Can I create a hand that HOLDS the controller?

I am trying to create a similar hand and controller model, similar to the one on the Meta home screen, where the hand is holding the controller, and not replacing it. 

I tried many things, I have an animated hand next to the controller that registers button clicks and animates the hand. However, the default position is not holding the controller, but rather being next to it.

Can some please please help on how to get the hand "holding" the controller by default?