Note that once you have a filesystem, you have to mount it to somewhere else than /var/lib/mysql, at least temporarily.
Otherwise you cannot copy from /var/lib/mysql into the new volume.
If you will mount the new filesystem to /var/lib/mysql (and only there), then the entry in fstab is more similar to existing entries (i.e. not a "bind").
It is good to refer to filesystem with UUID. You can see UUIDs with:
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