How do you set HSTS security headers?

Hi there - I am looking to enable HSTS on our domain, and although I have found a Webflow Universoity article on the subject, the options do not appear on my account as per the article.

This is the article: https://university.webflow.com/lesson/custom-security-headers?topics=site-settings#how-to-enable-hsts-response-header which says to go to " Site settings > Publishing tab > Advanced publishing options ."

However, when I go there, this is what I see:

Anyone got any ideas where this option may be?

@hugorodgerbrown - If you get an enterprise plan that is an option.