There's already a two-way data flow in the standards, so the charger could just ask the car to unlock if someone requests that at the charger. It does make sens

There's already a two-way data flow in the standards, so the charger could just ask the car to unlock if someone requests that at the charger. It does make sense for it to be a request to the car and the car can know the driver's preference on desired charge level (should be at least 80% charged, for instance) and/or alert the driver somehow that the request has been made.