Nissan vehicles often support it. Look up V2G (Vehicle to Grid). There ate several other models as well, with lots in experimental stages. But new cars are so

Nissan vehicles often support it. Look up V2G (Vehicle to Grid). There ate several other models as well, with lots in experimental stages. But new cars are sold every day. So you don't need everyone to upgrade their vehicle. Deployment will happen automatically - just like USB-C charging on phones & laptops.