trigger for on join in laravel echo server with

I am following this tutorial in, vue.js and Laravel using laravel echo server

I have the following code in Laravel-echo-server with

window.Echo.private('Room Name')    
.on('Channel Name', (e) => {
    //Code to receive the message

Do we have any option such that when new user join, the members get notified. I tried to search for on OnJoin, but seems like there is none.