Finally i managed to install custom Persian Font on my "Kindle E-reader 8th Generation"
using this method:
https://www.mobileread.com/forums/sh...d.php?t=187752
but not all fonts displays correctly.
for me this fonts worked together:
https://fontlibrary.org/en/font/iranian-sans
https://github.com/rastikerdar/vazir...r-Code.ttf.zip
thanks to 'Saber Rastikerdar' developer of Vazir-Code font.