Occlusion material and progressive ImmersiveSpace

In a progressive ImmersiveSpace, I created an object (a cylinder) and applied an OcclusionMaterial to it. It does hide my virtual content behind it, but does not show the content of my room. The cylinder just appears black.

In progressive (or full?) ImmersiveSpace, is it possible to apply occlusion material (or something else), so I can see the room behind the virtual content?

Basically, I want to punch a hole through the virtual content and see the room behind it.

As a practical example, imagine being in a progressive ImmersiveSpace, but you have a plane with an occlusion mesh applied to it above your Apple Magic Keyboard so you can see your keyboard.

Is this possible?