I tried using my Quest 2 on VRSpace.org and created an avatar through the 2D web interface, but it might be too much for the Quest2 to handle because when jumping in VR it bugs out. I'll try to get a video, but basically it quickly jumps back and forth between the 2D and VR interface and frame rates drop to 1-2/sec. (It might be related to Babylon 5.0 too)
That's not going to work in VR, ready player me is another application that opens in an iframe. It's just how it works.
(seems to be using three.js by the way)