إمّي

7 = ح = sound like h but sounds smoother
5 = خ = sound like kh or maybe similar like letter g sounds in Spanish
3 = ع = sound like aa but stuck in your throat
2 = ء = sound like a but sometimes make sounds like glottal stop

There are some other letter represent in Arabic transliteration like 9 or 8 but I'm not using it because I think not really necessary in this transliteration. Hope you can enjoy this song and lyrics transliteration