can another disk be added to a zfs stripe

Hello fs@

On a 13-stable host I have a 13-stable bhyve guest.
The vdisk is a 64GB zvol. In the guest, the filesystem is
also zfs. I'd like to add another 64GB zvol to this zfs, and
for the resulting zfs system (zroot) to remain a stripe.

Is it simply a case of, within the guest (after booting the
guest with an additional -d pointing to the unused-at-that-point
zvol) and running 'zpool add zroot vtblk1' ?

It's important the zpool remains a stripe not a mirror.

Or is there a better way of doing this?

tia,
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