Room and portals with FMOD?

+1 for me too!

I’ll mention that Oculus Spatialzer advertised that it has propagation features via mesh tagging. I’ve never used it though.

https://developer.oculus.com/documentation/unity/audio-spatializer-features/

Blockquote
The Audio Propagation feature of the Oculus Audio SDK provides real-time reverb and occlusion simulation based on game geometry. Its goal is to provide accurate audio propagation through a scene with minimal set up. You simply tag the scene meshes that you want included in the simulation and select the acoustic material for each mesh.