No, this is not possible with the River 3, it has too little power and capacity.

There are compact power stations, but to charge a plug-in car, you need at least 2000 W output power and a significantly higher capacity (at least 1-2 kWh), e.g. EcoFlow Delta 2 Max.

This is sufficient for emergency charging, but full charging is not possible.

Are there any power stations that are handy and light and can charge a plug-in car?