Work with guardian outer boundary when using openXR?

According to the docs, everything related to the outer boundary, like getting the points or even just showing it, has been deprecated. I tried and indeed when using the openXr plug-in, none of these methods work.

So is there no way to get any info about the outer boundary when switching to openXR? I'm aware that I can get the play area, but for example I can't show the outer boundary like the quest does automatically when the player physically gets too close to it. That would be really cool if we could at least have the option to show it from within Unity, because the info still exists somewhere.

Working with the legacy plug in doesn't work for me because I also want to use passthrough, which seems to require using the openXR plug-in.