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Yeah - custom columns feature heavily in GUI plugins, but IIRC they don't feature at all in Metadata Source plugins. But they have configuration panels so that's where you'd allow the user to specify them - should be no need to delve into the arcane world of Plugin Tweaks.
But, but, but -- can a Metadata Source plugin even write to custom columns. The fact that none of them do makes me wonder if it is because they cannot. David and/or Kovid would know.
Might need two plugins [Metadata Source Plugin] Wikidata Basics and [GUI Plugin] Get Wikidata Advanced.
BR
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