os.callSystem - Call a specific function

Hi guys,

I know how to call the AE and after to the .jsx script by this command:

os.callSystem("C:\Program Files\Adobe\Adobe After Effects CC 2019\Support Files\afterfx.exe" -r "C:\Users\Username\MyScripts\AE\script.jsx")

But I wander Is there a way to call a specific function within the jsx script?