Do you seriously not understand this relatively simple calculation?
WIN% is just EV basically
simple example is 2pt vs PAT: success rate of PAT (1 pt) is 94.1 so EV of a PAT= .941
success rate of a 2pt try (2pts) is 49.4% so EV of a 2pt attempt= .988
WIN% is just these EVs calculated wrt to down distance and time left in game over the recorded logs of NFL plays in same circumstances