How to add author for Creative Commmons republished articles?

I want to republish some Creative Commons licensed context from external blogs. Its easy to comply in the content, but I want to Author in my blog post to reflect the actual post author from the CC licensed external blog.

In Ghost it seems I can only add a new author by actually emailing an invitation to them, and having them accept. This is laborious for a simple repost of content.

How can I add a new author ID so the post correctly is displayed with the name of the actual author?

It defaults now to display with my own name as the author.