Notification timer

The idea is that when creating a conference, we pass an additional parameter - duration. And the meeting shows how much time is left until the end. It is possible to make an option - to end the conference forcibly when the duration is exceeded. How it is better to implement

Its Possible by using below Plugin.

In this case the same duration is specified for all conferences. 1.
1.Is it possible to send the duration at the start of the conference?
2. I would like to display the time until the end of the conference - from above - similarly to how the conference duration timer is displayed. Is it possible to do this?