Mobile Bookmarks Backup and Export

I just want to backup (export, save) my Firefox bookmarks, specifically my mobile (Android) bookmarks. It seems like I need to use Firefox Sync to accomplish this, and export on Windows. I have it set up on my Windows PC and Android phone now, everything is working fine, syncing, etc. However, when I export or backup (HTML, JSON) the bookmarks, the entire "Mobile Bookmarks" section does NOT get exported. Why? I've now also checked the profile data bookmarks manually on Windows and the Mobile Bookmarks do not seem to be saved there, either. The profile data on Android seems to be inaccessible (locked, hidden). How can I backup my mobile bookmarks? This seems ridiculous. I just want to backup my mobile bookmarks...