bhyve inside a jail sounds like a stunt. It isn’t.
FreeBSD has supported it since 12.0, and it turns the hypervisor into one more manageable jail: delegated ZFS, VNET, vm-bhyve, devfs rules and all.
Here is my complete production setup, including the security caveats
https://blog.hofstede.it/bhyve-inside-a-jail-the-freebsd-feature-nobody-uses/