This feature, at least in VirualBox, is useless. Machines that run hyper-v core do not boot properly, have their memory corrupted at boot, etc.
I wanted to use various things that rely on Hyper-V such as the Sandbox and WSL2 (last tried it in June), but the brokenness of VirtualBox forced me to abandon those technologies.
I still haven't decided which one is better, "buying in" fully on Hyper-V or sticking with a set of separate solutions, eg. MSYS2 instead of WSL2, Docker Toolbox vs. Docker for Windows, Linux VMs in VirtualBox on an as-needed basis, etc.
I wanted to use various things that rely on Hyper-V such as the Sandbox and WSL2 (last tried it in June), but the brokenness of VirtualBox forced me to abandon those technologies.