GSP files come from a software called Silhouette Studio and are projects that are saved on SD card for use on CAMEO cutters. You can use and pictures to the projects, before you export them, so in this sense jpg to gsp conversion is doable.
But numerous other .gsp file types exists and some are graphics, so for these jpg to gsp conversion also makes sense, it's just a matter of finding the right tool for your particular GSP file.
Updated: July 18, 2023