SpatialTap on NO entity?

How do I respond to a SpatialTapGesture in my RealityView when the tap is on no entity whatsoever? I tried just doing

RealityView {}
    .gesture(SpatialTapGesture().onEnded { print("foo") })

but that doesn't get called.

All I can find searching is advice to add Collision and Input components to entities, but I don't want this on an entity; I want it when the user is not looking at any specific entity.

SpatialTap on NO entity?
 
 
Q