Add Custom Fonts

Allow the user to select and/or manually install more than the default ~20 fonts so that they show down in the drop down menu in editor.

You know, like in EVERY OTHER MICROSOFT OFFICE APPLICATION!

It already works under the hood on the desktop and once published, online, as if you write your own theme.json you can expose them situationally, but A. this is a huge UX fail and B. you are seemingly limited to only ever exposing 1 font for the in-app drop down, resulting in the ENTIRE theming requiring editing .JSON files.

So fun.

If you want to see how this could/should look?

https://help.tableau.com/current/pro/desktop/en-us/formatting_create_custom_fonts.htm

:P