Cannot show Persian numbers

im code
```
#!/bin/python3.8
import cv2 
import pytesseract

img = cv2.imread('/home/netwons/Desktop/fff.jpeg')

# Adding custom options
custom_config = r'--oem 3 --psm 6'
text=pytesseract.image_to_string(img,lang="fas", config=custom_config)


f= open("/home/netwons/Desktop/py.txt","w")
f.write(text)
f.close()
```
**Cannot show Persian numbers**

