Ask HN: Anyone getting Chrome to HW encode video besides H.264?

I've been searching around the internet and cannot quite find the answer I'm looking for, so I figured I'd ask here.

Does anyone have Chrome or Chromium hardware encoding video besides H264?

chrome://gpu/ -> Search for "Video Acceleration Information"

I'm trying to see if it's possible to hardware encode VP9 or AV1, and have the hardware to do so, but not sure if adding the ability to do so within Chromium would require a custom build.