Is your feature request related to a problem or area of OpenRefine? Please describe.
I often need to extract the Wikidata Q-values from reconciled items. I now do this via "Edit column --> Add column based on this column" and then using the GREL expression "cell.recon.match.id" to retrieve the Q-numbers

Describe the solution you'd like
It would be handy to have a function ("Extract Q-value", or some other description) under "Edit column" to automatically extract the Q-value and put these in a new adjecent column.