Pomodoro or countdown feature

[AbelLykens]

The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s.[1] It uses a kitchen timer to break work into intervals, typically 25 minutes in length, separated by short breaks.

I would like to be able to set these kinds of timers in Nextcloud. If feels like timetracker is the right project for this.
It would mean a countdown and a sound when the timer hits 00:00. Then maybe be able to track the worked time?

Hope it all makes sense and someone wants to work on this. Thanks!