It depends on the EVSE you are going to be using and how many Amps you are going to pull with it. Most of the EVSE units out there pull 32 amps and the 8 guage would be fine. I have a ChargePoint Flex EVSE which can pull up to 50 if hardwired and I put in 6 gauge with a NEMA 14-50 outlet My ChargePoint is set to 40 amps which is the most a 14-50 outlet can handle. If you want to hardwire the Chargepoint flex to pull 50 amps, you will want a 70 amp circuit with 3 gauge wire. If you are drawing 40 amps, the Lucid is getting 9.6 kW per hour which would add about 58 kWh to the battery in a 6h super-off peak (CA) overnight run. It comes down to how long you are able to charge and calculating the speed you Need for the kWh you want.
Of course the Lucid Air can pull 80 amps (19.2 kW) if the EVSE can handle it. I would almost have the electrician pull wire for a a 100 amp circuit as the Lucid home charger will be at 80 amps for bidirectional charging if you want it. If you have two electric Cars, you might want that capability.