If you want to do more advanced work, yes, you would want to pursue a degree. However, it's pretty common for museums and historical societies to have roles for digitization assistants that doesn't require a degree, so if OP wanted to try it out first, that would be a good start. Also, you can find MLS programs that allow you to do coursework in related fields. For example, one of my cohort at Indiana University Bloomington focused on informatics, but she also did a bunch of courses in anthropology (IU has a big anthro program), because part of her interest was in digitization of indigenous/native music.