HDR/HDR10/HLG is already supported in LE and Kodi subject to the hardware supporting them; which is complicated on NUC type devices with LSPCON chips as those can modify the capabilities of the "HDMI" output path and prevent a universal/simple answer to what's supported. There are also bugs in Intel drivers that muddy the waters.
DV is already supported in Kodi (on Android with appropriately licensed hardware). However on Linux you will also need licensed hardware (so handling exists in silicon) and FFMpeg support. The latter appears to be progressing, but it will be a while before all pieces are version aligned. Kodi 'P' is about to bump from FFMpeg 6.0 to 7.0 and those patches are merged to FFMpeg master so should be in FFMpeg 8.x (or something post v7.0 at least) and there's likely to be more patching needed.
And for purists: There will never be an open-source implementation of DV to Dolby standards because the tooling and technical info needed for that require sign-up to their license regime (which is the polar opposite of open-source). So open-source DV support will always be limited to making something that looks nice on screen.