Voltage sensor and EO car charger

Hi, I have done some reading but can’t find anything that wouldn’t require lots of money and a degree in electrics to do the following:

  1. I have an EO car charger and I can’t seem to find anyway to integrate it into HA
  2. So I have a CT clamp hooked up to monitor current but this is not very accurate as the voltage is fixed into the esphome as 230V when it rarely is. I want to have a sensor read the actual voltage but can’t find out how to do it. The EO is a raspberry pi board but locked down and SSH turned off so can;t get into it to see if I can read a sensor.

Is there any way to build a esphome device that reads the mains voltage so I can use that to influence the voltage reading in the CT clamp?