ufs to zfs conversion in a freebsd guest

[tech-lists]

Hi

[context is freebsd-12R-p3]

Is it possible to convert a running freebsd guest from UFS to ZFS? 
It would need to be done in-situ, in the guest as there is no access to
the host.

The guest filesystem is:

/dev/gpt/rootfs   /       ufs     rw      1       1
/dev/gpt/swapfs  none    swap    sw      0       0

thanks,
-- 
J.
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