Malayo-Arabic Keyboard on iPhone.

there is a missing letter in the malayo-arabic script keyboard which has the sound ‘NG’. this is important letter because most of south-east asian words has that sound. it looks like this letters (غ/ع) but it has 3 dots on top of it. and I hope apple adds all possible/similar letters from other modified arabic letters around the world on the original arabic keyboard when you hold a letter for convenience.