It works great! However, when I edit the post and go to the optimize page it shows that the Word count of whats in the Title vs what is in the content.post_body. When I render the new content out, render out what in in content.post_body, but when I encounter a paragraph break I insert CTA code after so many paragraphs.
On a side note, it seems that this would be a good feature for Hubspot to have some kind of management system for blog posts, as I dont want to go thru all my blog posts and change out custom inserted CTAs. This was an easy way to add them across all assets if I am running an offer or something.
I dont know if I am missing some kinda of tag or ID that the optimize is using. The variabe content.post_body contains all the content it should be counting.