IIRC: if it is invoked from the library manager the editor can extract custom column values and write them to the content.opf. Don't know if that means an editor plugin could do the opposite.
I also wondered about the utility of storing it, but since you entertained the possibility I set my mind on how it might be done. Its presence would indicate one had done the checks.
BR
Last edited by BetterRed; 01-22-2022 at 04:45 PM.
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