There was a thread on this already in Battery and Charging, but wanted to post in accessories too.
I bought a V2H device from Setec Power in China that allows for bi-directional charging to pull energy from the LEAF through the CHAdeMO port. I testing it out and it works. Somehow I managed to order two of these devices and now have an extra one. Willing to re-sell mine if anyone else wants to tinker.
You can find more information about the device and manufacturer here.
Dimensions - 478.8(W)×375.5(H)×200(D)mm
Message me if you want more info.