Sexbass launch app from a browser on SLR website. One person told me it works, but you have to exit the app and go back to browser for each video. Though, webVR play in the browser itself is also an option.
If you want to do this with your local files, you can use XBVR (beta! but works).
It gives you a webpage much like SLR but with your local videos, over DLNA.
https://xbvr.app/
It also works in SLR/DeoVR (once it works again for Cardboard.)