How can I use third party font on Metro App ( e.g. Facebook apps )?

[Windows Central Question]

I want to use third party font on metro App ( e.g. Facebook apps )

Our country is Myanmar and we use Zawgyi font. But Zawgyi font is not available on windows 10 and earlier. So I install Zawgyi font on windows 10 but that font can't seen on Facebook apps ( downloaded from windows store ). How can I use our font on windows store apps