Alarm One Contact Sensor Permanently

I need to get a new alarm system and I’ve been looking at the ring alarm.

However, one red line requirement is that I need to be able to set up one of the multiple contact sensors so that it is permanently alarmed. It’s for an outside bike shed and it needs to raise an alarm if someone opens the bike shed door regardless of whether the alarm is armed or not.

Is this possible?

Many thanks

No reply required, found the answer in another post despite having searched beforehand. Basically can’t be done which I find difficult to believe since this is a basic requirement to protect your sheds regardless of whether the alarm is armed or not. Will be looking elsewhere.