Why no Full Electric Car Races at Le Mans?

Despite all the Hype around Battery Electric Vehicles, the fact is that in 2022, there is still not a single BEV car engaged at the 24h of Le Mans. Why? Where is the Technology? Power? Range? Fast Charging? Weight? What is the problem and what Engineers and Chemists are busy developing to be able to enter a EV HyperCar at Le Mans in a near Future