I think you have it backwards.

Gas stations don't need to evolve to become restaurants... restaurants needs to simply add chargers.

It isn't even a huge leap for customers to expect it either. Some 15 years ago there was a big push for restaurants and stores and markets to install wifi for their customers. This is not all that different, quite honestly. If a restaurant has 15 parking spots in it's lot, it shouldn't be a huge ask to install a handful of chargers which can be shared by most of the parking spots. Most parking lots already have some kind of power out there for signage or lightpoles. You can tap off that, or go solar.