zadm poweroff guest
zadm show guest > guest.json
zfs snapshot rpool/guest@20210520
zfs send rpool/guest@20210520 > guest@20210520
scp guest.json guest@20210520 new-host:
pkg install brand/bhyve zadm
zfs create -o mountpoint=/zones rpool/zones
zfs receive rpool/guest < guest@20210520
vi guest.json # if you need to change nic etc...
zadm create -b bhyve guest < guest.json
zadm start guest