Arabic TTS Web Speech is Missing some letters

Hello,

I would like to report an issue regarding Arabic TTS in Web Speech API.

The letters:
گ = g
پ = p
ڤ = v

These letters are part of the Arabic language day to day speech, specially the 'g' letter. But there is no method of making the Web Speech API pronounce it.

Please support these letters so it would be possible to produce Arabic and even other languages better.

Thank you,