How to customize author_meta fields?

I’m wondering if there is a simple way to do this with co-authors-plus – perhaps in the function.php as well?

Co-Authors Plus leverages WordPress user profiles by default. If you’ve added fields using the code snippet indicated, and everything seems to be working properly, then those values will be available to you on the frontend.

However, if you’d like to add fields to Co-Authors Plus guest author fields, that will take a little more work. Let me know.

This doesn’t seem to work if you create a Guest Author without linking it to an actual user account, so this feature would be a helpful addition for people who who have guest authors that don’t need actual WordPress accounts.

I hope it’s still on your drawing board to be added to future versions ??