minimumChargingRateKw property
Filters places by minimum EV charging rate in kilowatts (kW). Any places with charging a rate less than the minimum charging rate are filtered out. For example, to find EV chargers with charging rates that are at least 10 kW, you can set this parameter to "10."
Documentation: https://developers.google.com/maps/documentation/places/web-service/text-search#minimumchargingratekw
Implementation
final double? minimumChargingRateKw;