Changing the default font for multiple languages

[ahmedsomaa]

What's the best way to change the default font for the entire app based on the current app's language. I am working on an app that supports both EN/AR and each one has a different typeface, so I want to change the default font for the app.

for example, if the language is AR: the font should be Tajawal
and if English something like Roboto