No, but personally I would upgrade to 6.3.5 anyways.
The leading period tells mover to not bother moving the share to array. The more common method however is to set the appdata share to be cache only or cache-prefer
If the cache drive drops dead, the docker.img file is a joke to rebuild, and doesn't contain any "real" information or metadata
With a non-redundant cache drive, what most people do is backup the appdata share to the array (weekly?) CA Appdata Backup/Restore does this for you on a schedule
That particular directory is actually in RAM. And with plugins, the install pretty much has to be in ram. Docker, the install is within the docker.img file which tends to be stored on the cache drive.
By enabling Disk Shares on unRaid. But, TBH you're going to have an easier time simply pointing the docker appdata location for each app to the existing share/folder you've already got. Simply moving stuff around (especially over the network) will be problematic due to permissions, symlinks, etc. Best bet is to point the default docker appdata location to be /mnt/cache/.appdata/libraries, and then on installation of the new apps, verify the appdata (/config) folder is pointing to the existing folders.
Actually LT offers such a service, albeit for a fee. You can get details on their website.
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Other thoughts.
If simply pointing the /config folders to the existing ones from the plugins doesn't work, then you're going to be better off starting the apps over from scratch. Less aggravation and headaches that way.