Alexa, Ask My Car if it's plugged in

I'd like to be able to use the Alexa skill to ask if the car is plugged in. Currently, when I try this, it tells me the charge level. While that's valuable information, that's not what I asked. 

I like to make sure the car is plugged in before I go to bed so I know it will be charged up by the next morning for all the next day's driving needs.