Google is your friend, you can buy units or build a EV that will do it.... I doubt anyone here has built one as EV forums would be the place for that.
As for me I'm going to buy a Ford Lightning, but may or may not opt in for the part that will run my house. Expect to spend like $60,000 or so for that truck.
As far as using a 12v EV battery I know my Leaf would revolt at trying it. But you can buy systems that will use the high voltage side to power a house, just very pricey. In other countries the Leaf will do it out of box...