Yeah, I know... latest fads and all that ;)
But Mozilla is actually creating a pretty cool and very easy to use framework for WebVR called A-Frame: https://aframe.io/
It can be very easily used within HTML and already cool open-source web-projects such as this php CMS have arrived: https://www.ideaspacevr.org
And now things got even cooler with working multi-user support using standard web technologies such as WebRTC, see: https://github.com/networked-aframe/networked-aframe
A-Frame is working on all major VR platforms both PC based and mobile, so the entry barrier is minimal.
So maybe Hubzilla could add this as an eye-catching feature to attract attention? :) But regardless... it is probably a pretty cool feature to have, so that you can host your own VR space in the Fediverse and have your connections easily join you for a round of watching youtube or so...