There was a proposal from 2012 to set a standard to allow V2G (Vehicle to Grid) protocols https://www.energy.gov/sites/prod/files ... ow_rpt.pdf
but I have not seen any further development on that front at least in the USA. In Japan, at least one company makes an inverter, but it only seems to work on CHAdeMO vehicles. It communicates with compatible vehicles to enable the output. It is not designed to power a house, but that was awhile ago...they may have stuff now. The idea is to help use EVs to stabilize the grid when plugged in.
Anyone seen or heard of anything further? It's not all that straightforward trying to get power safely out of a vehicle, at least at higher power levels from that high voltage battery, at least without degrading the battery pack (which BMW would be annoyed with as their battery warranty isn't setup for that kind of use). I do think that, eventually, we may see V2G become a common thing, but probably not with this administration. Until mandated, I don't expect the manufacturers will be interested, except for maybe a low power load (a few already have 120vac outlets).