We will happily pre-configure the EVCC for you to help simplify your project setup. Provide battery chemistry, series cell count and amp hour rating if pre-configuration is requested.
I guess you can tell them specificaly which telegrams to send and they can program them in.
Here are the telegrams and wiring:
https://openinverter.org/wiki/Chevrolet_Volt_Charger
https://leafdriveblog.wordpress.com/2018/12/28/ampera-charger/