In order to trigger automation based on alarms at home, I found that I was stuck to using tasker and my mobile phone based on the information I was able to find online. If you had an iphone, it seemed even tougher to find a solution.
After some digging around I managed to build a simple script that can trigger different events on home assistant based on a timer going off on google home or an alarm going off. You can run the script on any device even a PC, you would just need to make sure your device is running 24*7.
Currently, I have the alarm set up to trigger one of my bedroom lights to blink until I stop the google home alarm. For the timer, I have set my desk light to blink, since I usually use the timer on my desk and having the bedroom lights blinking for this would be pretty annoying.
PS: If you guys think this is useful, it should be pretty easy for me to build this as a HASSIO add-on. Let me know your thoughts!