Welcome to Android Central! Use a file manager app to look around the user directories and see if those notes are accessible as individual files. If you can't find anything, then they're probably in a protected system directory. There may not be any good solution for you -- this is why I always recommend against using any preinstalled note-taking app for important notes, since these kinds of apps typically don't sync anywhere, nor do they offer an easy way to transfer or export data. In the future, stick with good cross-platform note-taking apps like Google Keep Notes, OneNote, or Evernote.