Use this tool to manage your audiobook library from the line. You can can add/list/rate books and mark them as completed. The library can be exported in a cli friendly format as well as html. Library entries can easily be updated an metadata may be written back to the files.
Check this page for an overview of how to use this tool: https://github.com/b0wter/fbrary/
This snap is using strict confinement meaning that you can only access files in your home folder. If your collection of audio books is stored somewhere else you can use a bind mount to make them available to the snap.
sudo mount --bind /storage/audiobooks /home/your_username/audiobooks/
You can make these changes permanently by editing
# <file system> <mount point> <type> <options> <dump> <pass>
/storage/audiobooks /home/your_username/audiobooks auto bind 0 3