Provide my own machine for Xcode Cloud

I'm working on some apps at the minute, with the intention of running a lot of automated UI tests. Xcode cloud looks great and has a lot of integrated features, but having to make sure I don't run too many hours so my subscription doesn't stop mid dev cycle, or getting a surprise large bill etc, are things I want to avoid. Even the cheapest paid plan for a year works out about the same cost as an M2 mac mini, which would probably be significantly faster than the cloud nodes.

Github actions allow you to provide your own machines. But actions requires a lot more scripting, and so far they've been very slow to update Macos/Xcode versions (not sure how this will effect supplying own machine). My preference would be to deploy my own machine for Xcode cloud, similar to what we used to be able to do with Xcode server.

I think this is currently impossible right? Is there any word that this might be an added feature in the near future?