I believe you can use the <<column title>> inside the HTML. You need to use the column title and not the merge tag from the template.
I don't think you can use the complete power of HTML inside the email for Autocrat. The fancy stuff should be in the template.
I can't remember the names right now, but there are sites that show the result of the HTML.
FormMule has a feature that creates a table of data inside the email using HTML. I think I have tried to use that HTML in Autocrat, and it doesn't work.
Have you tried using one of the AI tools to evaluate your code?
I'm not saying what you want cannot be done. It is a trial and error process unless there is an HTML inside Autocrat person in the group.