From an ESPN article today
Player A: 61.0% completion percentage, 7.4 yards per attempt, 6.39 adjusted net yards per attempt
Player B: 65.0% completion percentage, 7.2 yards per attempt, 6.35 adjusted net yards per attempt
Player A is Lamar Jackson's performance as a passer over the past two years. Player B is Matthew Stafford's performance over that same time frame, and Stafford has the largest cap hit of any player in football.
Adjusted net yards per attempt weighs touchdowns and interceptions in a more realistic way than passer rating while also incorporating sack yardage; after you do all that, Jackson has been just as effective of a passer as his far more expensive counterpart. As Jackson said earlier this season, "not bad for a running back."