The walled garden charging network looks like it may be a problem in the future, why hasn't an independent entrepreneur started setting these up and charging money for them? Why haven't gas stations caught on to provide 1-2 charging stations?
Now you want to dedicate one or two of those parking spaces to charge a car that will be there for 30-60 minutes.
The only way that will be profitable is if the fee to charge your car is at least 10x the average amount a customer spends. Otherwise, what happens is the parking spots fill up and prospective customers go elsewhere and offering car charging actually causes the station to lose money.
OTOH, restaurants offering charging spots could be a moneymaker because now there's a reason to keep customers there longer, and longer stays will generally mean they buy more.
Being a commodity intermediary does not really put them in a position where they can be generous with uncertain investments.