I updated the issues here: EtherealEngine/Universal-Volumetric#164 (comment)
This looks promising but is not complete and contains outdated info... it references UVOL and the other repo on XRFoundation calls it DRCS...
The unity demo there does not work, neither is there one in this repo, nor a work-flow for WebGL/webpage.
Keenly following, but as a non-coder can only hope for updates.
Regards.