Utilities is just a middleman between Calibre and the Kobo.
It can't have a (Calibre) column for something that does not exist ON THE KOBO, nor put something from Calibre anyplace EXCEPT a supported location.
You CAN use the (Calibre) Metadata Plugboard to fudge additional Calibre data into a standard Kobo field. Just be aware that too much fudge will break other interactions.
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