They are used by the quota management tool. Of course if you don’t use quotas that’s fine.
Now back to the permanent solution, now that we know which options work add this line

OMV_FSTAB_MNTOPS_EXT4=”defaults,nofail,user_xattr,noexec,jqfmt=vfsv0″

at the end of this file /etc/default/openmediavault the restart engined service openmediavault-engined restart
And proceed to mount in the webui