Hello, I want to port nethunter to a moto G4 plus.

Here https://www.kali.org/docs/nethunter/porting-nethunter/ says I should follow directions on the main docs page:

main docs.jpg
so I followed the directions on the main docs page, https://www.kali.org/docs/nethunter/building-nethunter/
and in the python build.py command because there is no option for moto g4 plus, I can't run it. What should I do?