There’s a function which already exists in the files of the WordPress editor which you can use to add more fonts to your visual editor.
All you need to do is install a simple fonts plugin which displays the buttons.
Once you install the Fonts plugin, it will enable these hidden buttons exactly the same as you see in this screenshot.
Feedback: If you install this plugin, please take a minute and leave a quick note or write a short review.
Did you build this plugin?
This is my plugin John.
The functions for this plugin already exist in the core WordPress editor files.
This plugin simply displays the controls in the editor so you can select font styles and sizes.