HDR10 + support if the hardware is able to handle it

There is no current disc content that supports the format.

So far it is limited to a limited number of Amazon streaming titles to 2017 Samsung TV models
only.

It may be months before any disc content is released.

Xbox playback app has hardly been a state of the art application with long delays in release of native bitstream out functionality and support for Dolby Atmos. Playback video levels still aren't fixed though issues have existed since the One S released.
I wouldn't hold my breath waiting.

HDR10 is supported but not HDR10+ as yet.

I seriously doubt that will be supported. Sound isn't something you just patch with software, it requires decoders and DACs which is also hardware related.

I'd assume they went with HDR10 for a reason as even Sony skipped the Dolby Atmos support.

Hope HDR10+ will be supported in the future because Samsung TV doesn't support Dolby Vision (supported by XBOX SeriesX) but only HDR10+

Also folks as I've posted before

Because a TV is HDR, it doesn't automatically mean it's HDR10. Best to phone your TVs support folks and double check.

If they confirm its HDR10 compatible then it's just a case of making sure the right settings on both console and TV are enabled.

Also check if your TV needs updating. I know certain Samsung models from 2015/16 were not HDR10 but with an update there were

Unfortunately if your TV isn't HDR10 ( could still be HDR ) then it won't be able to use all Xbox One Slim features, HDR10 gaming etc

Good luck