Create a Midjourney prompt for an ultra-realistic depiction in English of the American football player Brock Purdy scoring a touchdown in the style of the San Francisco 49ers and performing the "Griddy" dance. Elaborate on the specific details of this scene, emphasizing Purdy's actions, the football field ambiance, and the iconic 49ers aesthetic. Capture the excitement of the moment and the unique characteristics of both Brock Purdy's playing style and the renowned 49ers culture.