DV Profile 8/HDR10 fallback on Mac

Some question about DV Profile 8 fallback to HDR support on Mac.
Is this feature supported on Mac with an external display?
My TV supports both DV/HDR but due to Mac os restriction, it’s running on HDR.
The picture looks brighter on my external display when compared to the Netflix HDR source from Chromecast.
Media info

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5@Main
HDR format : Dolby Vision, Version 1.0, Profile 8.1, dvhe.08.06, BL+RPU, no metadata compression, HDR10 compatible / SMPTE ST 2086, Version HDR10, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 41 min 38 s
Bit rate : 32.0 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits