Example JSON to inject Please

[MasterJames]

Hi I am having trouble figuring out what the JSON formatting is like to inject the "Dynamic Metadata" (with scene or frame range MaxCLL MaxFALL or whatever it might be maybe "MasteringDisplay_Luminance":"min: 0.0001 cd/m2, max: 1000 cd/m2", but what the range vales are if it goes in a properties folder or what? Or where would I get that from. I tried to extract some from a YouTube video that claims to have it but I guess what I downloaded via yt-dlp does get anything because it says "File doesn't contain dynamic metadata". The process was that I used ffmpeg to convert a webm to mkv but still nothing.

Also tried exporting a timeline's JSON from Davinci Resolve but it fails to have anything meaningful in the file exported as well.