I noticed a PR in stashapp with heresphere support.  Looks like it has been in multiple attempted releases and then pushed out last month.  Not really sure why, but was hopeful while monitoring.  Just thought I'd let you know someone is attempting.

https://github.com/stashapp/stash/pull/3794

Cool, there's also some companion apps that work with stash and HereSphere:

https://github.com/o-fl0w/stash-vr

https://github.com/Tweeticoats/stash-vr-companion

Sadly, the change was rejected so native Heresphere support won't be coming.