If you just want to keep track of books that you have read from KU and have returned, and retain easy ability to borrow in the future (assuming it is still in KU then), create an Amazon wish list for this purpose and add the book to that ("KU books" or whatever). Wish Lists are accessible in the Kindle Store interface on Kindles and Fires, and from any web browser. Using a browser you can set 'priority' and add notes as well.
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