Occluder in GLTF/GLB?

First time poster here!

Is it possible to create a Holdout or Occluder shader for use with GLTF? I am looking to make a "magic" hole or door where the inside looks like another realm or dimension in the GLTF format. You can do this pretty easily with a Holdout material in Blender, but that does not seem to translate to the GLTF when exporting. Any Ideas on how to get this effect?

Second pic is what the GLTF looks like when exported