Gregory's Server@ross macOS does not support GPU passthrough equivalent to our native context passthrough, so this is not possible. VMs on macOS are limited to high-level Metal passthrough at most, which comes with all the same limitations and graphics driver bugs as native gaming directly on macOS.
You need to run Linux natively 😉
@AsahiLinux Damnit macOS! Steam on macOS is just such a disappointment and I keep on hoping that the 0.0% of users still using Steam on macOS will convince Valve to officially support Proton on it.