"Endorsed" might be too strong a word here. It’s listed as a book on MODx (along with all other known books on MODx), but I don’t think it has any official status.
To answer your question, though, you could put this in your template:
Then use your CSS file to specify how <h1> will be rendered.
BTW, it’s more common to use [*longtitle*] there and use [*pagetitle*] in the <head> section of the template:
<title>[*pagetitle*]</title>
You’re free to do what you want, of course.