App is available on Playstore
Here is the link
1. Set region to Myanmar in setting menu.
2. Install above app.
3. Choose whatever font you like and install with the help of in app instructions.
4. Go to settings>Display and Brightness
5. Then turn on the "Support dai characters"
6. Your font is now applied system wide.
7. If you have any ttf font file then paste that in Storage>Zfont>Fonts.
8. Now back to app and go to local section from toolbar above the home screen of app
9. Follow step3 and enjoy.
I have attached some SS of that app