It's not in the preview build yet. I should be uploading a new preview build tomorrow - I will let you know about it.
There's little I can do with support for oculus link/air link/virtual desktop besides adding manual setup of a play area. And even that is done a bit different to what headsets/systems provide, mostly because as a developer I have no access to pass-through, so it's more like moving rectangular area around and peeking/or standing at the boundary edge to see the boundary all the time and adjust the area.
And the problem is that ATM there is no way to read the actual boundary info from the headset. What's worse, if you take it off, move around and put it on again, the tracking gets desynchronized. It works for games that do not require the actual play area info. For anything more, it gets a bit messy and requires some weird solutions (like manually adjusting the play area).