2amigos CKEditor - use the specific font only

I have a 2amigos CKEditor widget installed at my Yii2 site (I mean this one), and I want to allow my visitors to use only one font in it. For example, now user can select from some fonts when creating messages by CKEditor using the dropdown, but I want to remove all of them except one.
Is it possible?

If you have configured a font for the site for custom text in css or somewhere else you can disable font selection in the ckeditor config

Thank you!
Probably it’s possible to remove fonts right from the dropdown list? I mean from this one:

Let’s imagine I want to disable all list items except, for example, Arial.
Is it possible?