How to retrieve the messages entered by participants in Meeting and how to add the custom button to chat in meeting

HI team,

I am new to Jitsi platform and working on Android SDk.

Can anyone let me know how to retrieve the message from chat interface dynamically when the meeting is going on.

If suppose 10 members participated in the meeting and when meeting is going on if anyone types any message i need to fetch that message and reply back to him privately automatically from my code.

Experts help me on this.