There are a few titles that support the newest dynamic metadata format HDR10+ so it would be fantastic to add its support to a future firmware release. MKV container should be fine as well as M2TS files.
Goran Radakovic commented
jeremy m sturgell commented
And Dolby Vision when possible
Please add HDR10+ , it is a "free" license ($ 4000 per year for the SOC vendor).