Owners/editors should be able to create bylines manually

Adding a +1 here. Substack has this as a way of doing this.

https://support.substack.com/hc/en-us/articles/4406178016148-How-can-I-add-a-guest-author-to-a-post-#:~:text=The%20guest%20writer%20will%20get,also%20receive%20a%20confirmation%20email.

That said, simply being able to attribute the byline manually and not giving them access to the Ghost backend would work even better for us. We don’t need lots of users in our backend, we just need to be able to credit them properly.

I have looked at these:

But the solutions suggested link to a resource that is no longer available