About nested virtualization for bhyve

[alphachi]

I know the scheme like this can be implemented:
Layer 0 - KVM on Linux Host
Layer 1 - FreeBSD guest
Layer 2 - bhyve guest

Does bhyve support the following schemes?

Scheme A:
Layer 0 - bhyve on FreeBSD Host
Layer 1 - FreeBSD guest
Layer 2 - bhyve guest

Scheme B:
Layer 0 - bhyve on FreeBSD Host
Layer 1 - Windows guest
Layer 2 - Hyper-V guest

https://wiki.freebsd.org/bhyve just refers how to enable nested
virtualization on non-bhyve hosts like I knew.

What about on a bhyve host? For example, any configruation in
/boot/loader.conf or /etc/sysctl.conf to enable it?

Thanks!