h2 supported json proposal

example.com.h2.har.json

{
  "log": {
    "version": "1.x",
    "creator": { },
    "pages": [
      {
        "startedDateTime": "2015-07-14T00:43:05.821Z",
        "id": "page_1",
        "title": "https://example.com/",
        "pageTimings": { }
      }
    ],
    "entries": [
      {
        "startedDateTime": "2015-07-14T00:43:05.821Z",
        "time": 288.5760000208393,
        "request": { },
        "response": { },
        "cache": {},
        "timings": { },
        "connection": "356418",
        "pageref": "page_1"
      },
      {
        "startedDateTime": "2015-07-14T00:43:06.167Z",
        "time": 339.1340000089258,
        "request": { },
        "response": { },
        "cache": {},
        "timings": { },
        "connection": "356418",
        "pageref": "page_1"
      }
    ],
    "connections": [
      {
        "connection_id": "356418",
        "frames": [
          {
            "startedDateTime": "2015-07-14T00:43:06.167Z",
            "time": 339.1340000089258,
            "frame": {
              "length": 20,
              "type": "HEADERS",
              "flags": [
                "END_HEADER"
              ],
              "stream_identifier": 1,
              "frame_payload": {
                  "stream_dependency": null,
                  "weight": null,
                  "header_block_fragment": "HPACKED hex string",
                  "pad_length": null,
                  "exclusive": null,
                  "padding": null
              }
            }
          },
          {
            "startedDateTime": "2015-07-14T00:43:06.167Z",
            "time": 339.1340000089258,
            "frame": {
              "length": 20,
              "type": "DATA",
              "flags": [
                "END_STREAM"
              ],
              "stream_identifier": 2,
              "frame_payload": {
                "data": "hex string of data",
                "pad_length": 6,
                "padding": "xxxxx"
              }
            }
          }
        ]
      },
      {
        "connection_id": "356419",
        "frames": []
      }
    ]
  }
}