How to make particles in a particle emitter bounce with each others

Hi,

I want (me and a friend in the community) to make particles bounce not only with the screen but also between each others like in this example of Phaser 2 https://phaser.io/examples/v2/particles/collision , how to make it possible ?

Here is a base example

https://codepen.io/nazimboudeffa/pen/ProPwp