NFL QB rushing stats are complied when the QB has the element of surprise. The defense is defending against the pass and the QB pulls the ball down and picks his way through a broken field. Or there is a relatively rare designed QB run. In his peak rushing season, Lamar Jackson, averaged less than 12 carries per game, including scrambles on a designed passing play. NFL teams are free to direct snap to their best few rushers and run it down the throat of the defense. No modern NFL team does that because a predictable NFL offense is easier to defend. A few teams tried running the wildcat a few years ago and had some early success. It was short-lived because it became predictable and early success could not be sustained.