There is no widely recognized official studio version or "MP3 download" of John Legend covering this specific song. However, he is well-known for his own soulful hits and piano-driven ballads:
John Legend - Tonight (Best You Ever Had) (Live on Letterman) John Legend This Is What You Came MP3 Download
The lyrics were written by Taylor Swift (initially under the pseudonym Nils Sjöberg). There is no widely recognized official studio version
If you are looking for John Legend's music or a potential cover, here is the most relevant information: Artists: Calvin Harris ft. Rihanna. Release Year: 2016. John Legend This Is What You Came MP3 Download