[wrxtasy]

Is there any combination of Kodi settings that will have Kodi output Dolby Atmos over an ARC connection using the DD+ codec?

If you have a modern 4K TV that is advertised with "Atmos" capabilities you will find that it can also accept lossless Dolby TrueHD/Atmos from any HD audio passthru capable Kodi media player.

AND those Atmos TV's will then remix that THD/Atmos audio into DD+/Atmos which can then be sent out via regular HDMI ARC.***

***Tested with my Atmos capable GZ Panasonic OLED.
I believe LG 4K HDR Atmos capable TV are the same.
Sony Atmos 4K HDR TV's as very likely as well to have the same capabilities.