Is this a Chicken <> Egg issue? (existing books)
How do you get your 'list' item match up with the Calibre book entry {id}?
Look at the 'commandline tools' on the help site. (calibredb for a starter)
You need to get, THEN match the (calibre) ID (put it in the List)
I would first try the Import List (plugin): from CSV which uses Match Author and Title. It has identifiers:ISBN as a field target
BACKUP your Library before you do ANY BULK type operation.
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