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The plugin gets the list of IDs from the books in the library (since there can unlimited number of identifier types). If your library is empty, or if it has no books with and isbn identifier, the ID:ISBN field will not show up.
The solution to this is to create an empty book, and add dummy isbn identifier to that book. e.g. isbn:123456789. You can delete this book after you complete your import.
Edit: to create an empty book: Add Books > add an empty book.
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