FontForge - transliteration, letters Yu and Z, how to make the display case-sensitive?

Question

Fonts

The Arial font was limited, all characters were replaced with transliteration, everything works, works correctly, except for one
there is the word
YAMA -> YAMA
pit -> yama
If you write with a capital first, then it turns out like this -> YAma, how to make the letter I from the case of the next letter was displayed differently and the word was like this Yama