As it’s been discussed on the forum on numerous occasions, Dolby Vision will most likely never come to the OSMC platform as it would have serious implications on the open source nature of the devices as well as on features everyone’s used to
What’s being looked into is mapping DV profile 5 (mainly used for streaming) to HDR10 output though - this would allow you to playback those files without messed up colours. There’s no ETA though. Other DV profiles offer HDR10 fallback already.
See here e.g.: Dolby Vision - #19 by sam_nazarko