Unable to use the hand tracking menu function

I found a few posts asking about this but none of them went anywhere or solved the issue. 

Your left tracked hand has a menu function that loads up on a small circle. Is there any way to actually use that in app? Is there a callback or a button press to detect for the input? 

I would like to open a menu using that interface but I cannot find an example anywhere of someone being able to use it properly. I have gesture detection working for pinching and other things but I would like to hook up to the Meta interface for having a delayed input on opening the menu.

Any help would be much appreciated.

I am in Unity 2020 using OVR v1.70 SDK38