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FreeBSD zfs swap file
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Tests on FreeBSD 14 using ZVOLs for swap files does not work.

AFAIK If you can't grow your swap partition then this is the only way to add a swap file with zfs.


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Add partitions or disks and mirror them
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gmirror label -v -b prefer -F swap0 /dev/ada2 /dev/ada3

gmirror status

echo "/dev/mirror/swap0 none swap sw 0 0" >> /etc/fstab

swapon -a

swapinfo


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Done
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