Ask about iPhone 15 pro

No. It does not appear Zain supports eSIMs on the iphone in Iraq, though they do in some other countries.

Here is the complete list: Find wireless carriers and worldwide service providers that offer eSIM service - Apple Support

The list is published by Apple and may lag behind a bit. If Zain in Iraq said they support it, then I’d say it’s up to them to make it work for you.