If vfs.rar does not work, the vfs.libarchive add-on is sometimes used as a substitute, although it may behave differently with specific archive structures.
I can provide the specific installation steps for your setup. xbmc/vfs.rar: RAR VFS addon for Kodi - GitHub vfs.rar
If a RAR archive is created as "solid," the addon must unpack the entire file before playback, causing delays, especially with larger files. If vfs