I saw a video about a link from Somnium to HiFi. Is that a permanent two-way thing or just a demo of some sort? Can I find it in HiFi?
You might take a look at SVVR’s Multiverse: https://www.roadtovr.com/merging-irl-events-with-vr-via-svvrs-reality-portals-metaverse/
They demoed it at the most recent meetup and their goal is to connect different virtual worlds in a browser.