An input or similar to allow the automatically generated canonical URL to be overridden on a per-post basis.
As far as I know this feature exists. While editing your post click the gear icon in the top right -> change the text under Post URL
Correct, but to be more specific the desire is to be able to change the canonical URL independently from the post URL. The posts from my pre-imported-to-Ghost blog were under the slug /blog/year/post-title, but after the import I now have them at /post-title. If I could change the canonical URLs independently then I could recoup the share stats associated with those old URLs.
I came looking for exactly this. I run a few different blogs with some slight overlap in content and would like to edit canonical urls for cross posting purposes. It would be great as a built-in input underneath “Post URL”.