I think you need TAG like column because there could be more than 1 Author.
Then I would use the BULK mode Search and Replace of the Metadata Edit to populate.
As you can see, this is a HIGH MAINTENANCE method (meaning you need to do this every time new books are added.
My question:
Why the: 'sort'?
Just search
Authors: Jim, if that is the first name (or fragment) you want.
(I never needed this feature, since I am not on a First name basis with any Author
)