Example code request for filling in

Problem/Motivation

Thxs for the good work !

I installed everything good for Ckeditor 4, Drupal 10. I would like to enable Calibre font.

So this should be filled in the box where the help says:
Enter fonts on new lines. Fonts must be added with the following syntax:
Primary font, fallback1, fallback2|Font Label

As for me it is not clear how to specify these values.
Also regarding my wish for Calibre should I downloaded and place the font somewhere?

I red the documentation of the plugin itself but it is redirecting to the config file. So for it is not so clear either.

config.font_style = {
element: 'span',
styles: { 'font-family': '#(family)' },
overrides: [ { element: 'font', attributes: { 'face': null } } ]
};

Therefore do you have examples how to fill in : Primary font, fallback1, fallback2|Font Label