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Parallels on Mac did this in reverse a decade ago. You could dual boot windows and MacOS, or you could boot into your windows OS while running MacOS and access both file systems properly.

Ok but MacOS is the worst of the 3 worlds. It can't run Linux or Windows apps

Not true, 86box while slow on new apple ARM silicon can boot windows XP, and QEMU on Intel silicon will allow you to boot all thee OS at once.

MacOS has a lot of issues (mostly by Apple recent policy changes), but posix systems are more alike than different. =3

https://github.com/Moonif/MacBox

https://github.com/86Box/86Box/releases/tag/v4.2.1

When you use WSL2, Windows itself is running virtualized on Hyper-V.

At least with VirtualBox and VMWare it is possible (not actually WSL but still).