Both XML and JPEG formats are used for many things, so various types of xml to jpg conversion might exist. The most likely export though is based from special MusicXML notation sheets and their export as common pictures to JPEG format. This is actually standard feature in many music notation software.
MusicXML content can feature different extensions though, including .musicxml or mxl, so you might find more options under musicxml to jpg conversion entry for example.
Updated: September 21, 2023