Include a graphic with pushover messages so we can tell a warning message (not plugged in) from regular running (car is going to sleep)

I looked at Pushover and it seems you can embed a graphic in messages. I’d love to see those used to add some simple decoration - maybe just a color bar even - to help me tell the difference between a informational message and something I need to take action on. The main one is “not plugged in” which I’m missing because it looks the same as “car is going to sleep” messages. Thanks.