Option to stop alarm automatically after a set time

[dafishdev]

Is your feature request related to a problem? Please describe.
It's annoying to have to take out your phone to turn off the alarm when you're in a public place.

Describe the solution you'd like
There should be an option in the alarm settings to set a time after which the alarm automatically terminates. It could be a slider and it should be possible to set it in single second increments or five second increments. The alarm text should be displayed all the time the alarm is ringing, as it always is, but it would be nice to get a notification in the device's notification bar with that alarm text as well, so you don't forget what the alarm is about.

Describe alternatives you've considered
The previously requested feature of being able to turn off an alarm by shaking the device addresses a similar problem, although in some cases the described feature would be more appropriate.
It would also be fine if it was implemented as a switch ("short notification"). In this case, the time would be set (maybe changeable in the settings).

Additional context
I would use this feature in combination with the vibration turned on and the volume set to zero. So you could use this feature to just get a short notification that there is something to remember, more than an actual alarm.