The Leaf has Chademo as DD says. that allows a DC inverter to both add and take from the car battery. But that would need a dedicated Chademo V2G charger to connect direct to the car's traction battery. Those are expensive (like £5k) and pretty much impossible to get hold of - mostly they have only been available via trials.
The forthcoming new Leaf model will be different. It will have an inverter on board to output 230V AC, and will then have capability to power things. It's same architecture as Renault 5 I think under the skin. The car isn't launched yet, AFAIK it should be later this year. The R5 is already available and would be a great choice BTW, some other cars also have V2X already, but most manufacturers are a bit quiet about connecting to the grid, it's not necessarily simple, so looks like Renault and Nissan will be the first to offer it more widely.
The older Leaf wouldn't be compatible with the new charger when launched in '26.