The LibreElec team created a “Spotify-Connect Kodi addon for LibreElec”, which is basically a wrapper for LibreSpot. It would be cool if OSMC could do something similar and create a similar wrapper for LibreSpot, put it in the OSMC App Store.
The only goal would be to use OSMC as Spotify-Connect receiver. The current solution to achieve this is Raspotify, but as @sebtron noted, since it is not integrated with Kodi, some users will find the experience a bit poor.
The Raspotify wrapper: https://github.com/dtcooper/raspotify
Marcelveldt, creator of the Spotify add on for Kodi explains his addon: https://forum.kodi.tv/showthread.php?tid=265356&pid=2648150#pid2648150