In the movie Baby Driver, in the Coffee Run scene, some of the lyrics of the song are plastered in graffiti on the walls while the main character walks to the coffee shop.
Has this ever done before or was Edgar Wright the one who created it?
Yes, it's done.
In Telugu movie Sye (2004), there is a song Urura Urura. The main characters literally sing what is shown on wall posters, cutouts, and hoardings. (I am a Telugu speaking person.)
The postures, hoardings are in Telugu and he reads the same. For English for crosschecking, see the video from 1:13 to 1:24.