Need help writing a LUA filter: merge all Para from a Div to a single Para.Str

[Dmitriy Krasilnikov <dmitriy.krasilnikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Greetings!

I'm trying to convert RST admonitions to one-liner strings.

Here's the JSON output for a «Note» admonition:
{
  "t": "Div",
  "c": [
    [
      "",
      [
        "note"
      ],
      []
    ],
    [
      {
        "t": "Div",
        "c": [
          [
            "",
            [
              "admonition-title"
            ],
            []
          ],
          [
            {
              "t": "Para",
              "c": [
                {
                  "t": "Strong",
                  "c": [
                    {
                      "t": "Str",
                      "c": "Note"
                    }
                  ]
                }
              ]
            }
          ]
        ]
      },
      {
        "t": "Para",
        "c": [
          {
            "t": "Str",
            "c": "Причина"
          },
          {
            "t": "Space"
          },
          {
            "t": "Str",
            "c": "необходимости"
          },
          {
            "t": "Space"
          },
          {
            "t": "Str",
            "c": "закрепления"
          },
          {
            "t": "Space"
          },
          {
            "t": "Str",
            "c": "понятия?"
          }
        ]
      }
    ]
  ]
}

How can I convert this top-level Div to a string like: Note: <text from the 
next Para>? I'm new to LUA, been googling all day but no hints.

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