Xbox has announced that Dolby Vision is available on Xbox Series X|S as of right not with over 100 games either supported now, or in the very near future. This includes Halo Infinite which will support Dolby Vision at launch.
Dolby Vision is a HDR standard which provides 40x brighter highlights and 10x deeper black levels. It’s available on select 2020/2021 Sony, LG and TCL TVs. Samsung does not support the Dolby Vision standard currently.