I'm looking for ways to get the following workflow going:

• Check Wikidata items for cases where there is a PMID (P698) but no "main subject" (P921)
• When such an item is found (let's call it QA here):
  • get the MeSH terms associated with that PMID and for each of them
    • look up the Wikidata item corresponding to the MeSH term (via P486)
    • set P921 of QA to QB

Would this be something that could be fit into GeneWiki workflows?