How to use custom font in your email template
This is done by using the page style custom CSS setting:
You can select the needed font on this website, for example, take this font:
https://fontlibrary.org/en/font/d-din
If you scroll to USE THIS FONT:
you can see the link code, which has to be used like:
@import url('https://fontlibrary.org/face/d-din');
Then for the needed block, you can add the custom font: