Well in theory I would say yes to both because:
the source is created automatically, e.g. each CNA in the chain applies their source.
As for assigner, in the DWF world we're using signed git commits and/or signed JSON files (so you can create a JSON file and sit on it for embargoed situations and then submit it for automated processing), so it MUST be signed by someone who is a valid CVE mentor (cause we need proof of where it came from), so again that data is automatically harvested/added to the entry (once we get automation).