debian chromium-browser: open console.log in linux terminal

i have build a kiosk with chromium-browser on it and i show only my website there.

what i want to do is:

1. listen to console from terminal

— so i can run .sh script or python script based on what my site print in console log

example i can print console.log(reboot_now) and if i recive that i can
program to reboot the system

i think i can achieve this by listening console.log  or create custom url example <a href="runThis:\">BTN</a>

2. and also i need to run a javascript function on chromium-browser on my site(always will be my site there)

example my_page_refresh_function(); or alert(‘test’);