Zoom Key bind for VR Controller

I am not able to bind the Oculus Controller Thumbstick to zoom in and out of the chart like I can with the mouse wheel. Everything bound to the mouse wheel is mapped to the thumbstick on my Oculus Controller but I can’t zoom in and out of the charts.

Is this ‘hard wired’ to only the mouse wheel or is there a way for me to bind this to the oculus thumbstick?

Any help will be appreciated! Thanks