How to use a downloaded font in preview
There may be a bug in some versions of Preview so that some third-party fonts do not appear in the Annotations font selection control.

Preview missing lots of fonts that are shown in font book

Also, note that amateur fonts which may not have been created to professional standards have traditionally been responsible for a variety of problems.

The books of "Diary of a Wimpy Kid" use Coop Forged as their typeface.
https://houseind.com/hi/typography_of_coop