The Encoding.com API already supports two of the three primary formats of high dynamic range (HDR) video:

HDR10 allows content producers to define a static set of master display parameters, as well as minimum and maximum luminance. CLL and FALL metadata are also utilized.
Dolby Vision allows colorists and producers to create dynamic lighting metadata throughout a feature, permitting tight control over the backlighting of a display so dark scenes maximize contrast without bleed-through, and still allow for intense brightness when needed for a scene. Encoding.com supports profile 5 single layer with Dolby Vision only support as well as profile 8.1 single layer with Dolby Vision and HDR10 fallback compatibility.
HLG Hybrid Log-Gamma is a backwards-compatible high dynamic range standard.

The third format, HDR10+, is an expansion of HDR10 that also permits dynamic lighting changes throughout an asset. It's in active development on our platform. If you'd like to work with HDR10+ content today, please contact us for early access to this format!