Hi,
If it is so much of an issue that you would be willing to implement a workaround, I might have one for you. In the property called “original source drill-down 2”, you have the user ID of the user who created the contact if it was created manually or via an extension. You can either export and map this to actual names or you can use a tool like zapier to mapp the user ID to actual names in HubSpot.
Let me know if you have any questions in this regard. I’d be happy to help out.
/Jacob