{identifiers} is the home of ASIN and others and that field is a bit different from others in that it has 2 sections: identifier type (eg ASIN, UPC ) and the identifier value)
(this is the S&R part of Bulk mode MDE)
The source setup to copy from {identifiers} is in red. (your type choices will reflect what is available in YOUR library)
My TESTLIB example used my Comments type field, (blue destination), so choose any field type that will accept your values (string)
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