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As I said it is a current limitation in calibre that metadata plugins cannot download into custom columns. It isn't some grand conspiracy against non-fiction users, there are a number of ideas or things users would like to scrape using metadata download into a custom column. I only mentioned fiction as a reason why it is not a "standard" column.
There is a thread in the development forum which discusses this custom column download limitation, no-one has as yet picked up the ball to enhance calibre to allow it. I have no doubt it will happen "one day" but right now there is no-one actively working on it that I am aware of.
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