Is Pants’s build-in test parallelization not sufficient for your case?

It’s not, at the moment. I initially was looking to try to implement https://github.com/pantsbuild/pants/issues/15026, but encountered some issues with pytest-xdist, and wanted to try implementing a workaround in case it ended up being difficult to implement the pytest-xdist feature into Pants. (Issue I ran into is described in the thread on https://pantsbuild.slack.com/archives/C046T6T9U/p1658777475033269.)