The GWToolset allows to add ”Item specific categories” based on metadata fields.
For example, Using "Painted by" → "Painted by <artist name>".

Wikimedia Commons categories do not necessarily follow this “Blahblah <X>” schema ; to take an example, I want to add the category “[[Category:1562 in France]]” as [[Category:<X> in France]] with X = date.

(This is challenging UI-wise :)

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