OK, I did not expect to standard to be so "limited".
However, it might make it easier to "convert" the "included" 120v EVSE to 240v operation, at least at its default max current (possibly 12 amps). Of course, use of the modified EVSE would not be completely legal, I suspect.
Apparently all J1772-complient vehicles either need to accept 100 volts to 260 volts AC as input, or do their own voltage-checking before "connecting" internally to the car's internal charger.
Since a "120v-only" charger in a car (or a "240v-only" charger) cannot determine the supply voltage until after it "turns ON" the AC power through the EVSE, the car would need to isolate the input from the one-voltage charger, turn ON the AC power, check for an acceptable voltage, and then either connect the charger and begin charging, or refuse to charge (and probably shut OFF the EVSE).
What are the resistor values specified for the EVSE, the "nozzle", and the car?
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle