Comment by NebulaStorm456

This trope has been used in "Free Guy" movie (not a marriage proposal but as a love letter)

https://en.wikipedia.org/wiki/Free_Guy

Guy reveals to Millie that his code is actually a love letter to her from Keys: during the development of Life Itself, Keys had encoded what he knew about her tastes into an AI routine in the game, which was eventually incorporated into Free City, explaining why Guy felt drawn to MolotovGirl.