I have been able to take a static audio file and implement it as an AudioFileResource attached to an entity in my RealityKit scene. But I currently am using AVAudioEngine to change pitch based on relative position, and ideally I would be able to spatialize the sounds I'm generating relative to 3D points. I have experimented with AVAudioPlayerNode sourceMode, but as far as I can tell there is no way to tie an AVAudioPlayerNode to a 3D point in my AR scene unless I can attach my audio to a RealityKit AudioResource. Is that possible? Is there some other way to do it?