rar2fs is a FUSE based file system that can mount a source RAR archive/volume or a directory containing any number of RAR archives and read the contents as regular files on-the-fly.
GitHub - hasse69/rar2fs: FUSE file system for reading RAR archives
Kodi already got built-in support for this but rar2fs would make it possible to also add this feature for any docker plugin.The Plex server for instance.