2 Mostly Used Burmese (Myanmar) Alphabets Missing on Magic Keyboard

Bought and iPad with magic keyboard in Japan.

Two most used Burmese alphabets are missing on magic keyboard, Japanese layout, i think.

I can’t type the very common alphabets “ရ” and “ဂ” with magic keyboard, even though I can on the on-screen keyboard.

How can I fix it?

Please Help!!