Reversing of youtube client context's names

client_context.json

{
  "1:0:embedded": {                             // client
    "1:0:embedded": {                              // context
      "1:string": "fr",                              // hl
      "2:string": "FR",                              // gl

      // 4? "remoteHost": "141.98.6.54",

      "10:string": "FR",                             // ???

      "12:string": "Apple",                          // deviceMake
      "13:string": "iPhone11,8",                     // deviceModel
      "14:string": "...%3D%3D",                      // visitorData
      "15:string": "Mozilla/5.0 (Linux; ....",       // userAgent
      "16:varint": 5,                                // clientName
      "17:string": "16.46.5",                        // clientVersion
      "18:string": "",                               // osName
      "19:string": "15.2.0.19C56",                   // osVersion

      // "originalUrl": "https://m.youtube.com/",
      
      "21:string": "fr-FR",
      "21:embedded(?)": {
        "12": "0x53552d6e"                           // ?????
      },

      "22:string": "FR",

      // "playerType": "UNIPLAYER",
      // "screenPixelDensity": 1,
      // "platform": "MOBILE",
      // "clientFormFactor": "SMALL_FORM_FACTOR" / "SMALL_FORM_FACTOR" / ???
 
      "25:string": "ABCDEFGH-xxxx-xxxx-xxxx-xxxxxxxxxxxxx",
 
      // "configInfo"
      // "screenDensityFloat": 1,
      // "browserName": "Firefox",
      // "browserVersion": "14.2",

      "37:varint": 320,                             // screenWidthPoints?
      "38:varint": 569,                             // screenHeightPoints?
      "39:float32": 2.0,
      "40:float32(?)": "0x4063bbbc",
      "41:varint": 2,
      "46:varint": 1,

      "50:varint(?)": 222613015,

      "55:varint": 320,
      "56:varint": 569,

      "61:varint": 3,
 
      "62:embedded": {                              // Likely tracking
        "1:base64": {},
        "3:base64": {},
        "5:base64": {}
      },

      "64:varint": 23,                              // androidSdkVersion

      "65:float32": 2.0,
      "67:varint": 60,                              // utcOffsetMinutes

      "78:varint": 1,                               // userInterfaceTheme?

      // "mainAppWebInfo"

      "80:string": "Europe/Paris",                  // timeZone

      "84:embedded": {...},                         // Likely tracking too

      "94:varint": 5,
      "95:varint": 3768228,

      "97:embedded": {
        "1:varint": 1,
        "2:varint": 175127
      },

      "98:string": "HONOR",

      "99:embedded": {
        "1:string": "FRA"
      }
    }
  }
}