How to send push notifications to browsers from a Flask app running on a local network (LAN)? [closed]

I’m building a self-hosted local network messaging system with flask and flask-socketIO.

The app runs a Flask server on:

Users connect to it through their browser on the same local network.

I want to send push notifications to users in the browser when they receive a new message even if they are on another tab.

Full repo link(if helpful) : https://github.com/tromoSM/HostTalk