menu button mapping in ue4?

hi, I realize that you cannot assign a home button input since it is reserved for the dash, but how about the menu? I don't see an input for it on unreal, and this page doesn't show it too: https://developer.oculus.com/documentation/unreal/latest/concepts/unreal-controller-input-mapping-reference/
(I'm on the rift actually, but I assume it's the same)

I read somewhere that it was gamepad special right, but that doesn't seem to work anymore.
is it disabled for dev too? I don't see any external usage like the home button