Assalam alaikum,
I tested the "Simplified naskh" font it really includes Pashto letters. Thank you so much brother for adding them.
Translation of the words:
"Simplified naskh" = "ساده نسخ"
"regular" = "ساده"
P.S: Isn't there any other font of you in which you can add these Pashto letters - It will be great?