It seems like you could put an alarm in the garage and hardwire it to those in your house.Ford had the brake switch corrosion switch issue back in about 2006-8 that caused fires and we were told to park outside. I had a Ford truck at the time. Yes, now there is another recall and battery problems with the Lightning.
I have a firewall between the garage and house but I fully understand your concern. A fire could be cooking out in the garage for quite a while before you would know about it. I wonder if they make garage specific alarms?