Have been waiting on this for a while. Once GrapheneOS make this feature compatible with hardening features (a high priority) it will be on GrapheneOS too. We want to support other operating systems including other Linux distros or Windows 11 and running nested GrapheneOS VMs as well.
Discussion
There's also an old POC desktop mode in developer options but it's very limited, there's a far better one hidden behind feature flags.
Having a desktop mode with support for using these VMs is paramount.