Hi Bob, thank you for the quick response.
I’m talking about the rel attribute for the posts themselves. For example, if I wanted to differentiate a article written by a guest who pays a fee, I would set the maintag as “sponsored” and have the rel attribute be “sponsored,” whereas normal posts would not have any rel attribute. This distinction makes it easier for readers using my RSS to see the sponsored posts, etc.
But it doesn’t appear that an option for changing the rel attribute exists per post. It would look like the picture I’ve attached, except for the actual posts themselves, not links within the posts.