Output: [
  {
    "interface XYZ" => [
      { "given param1" => [] },
      {
        "given param2" => [
          { "given param2.1" => [] },
          { "given param2.2" => [{ "given param2.2.1" => [] }] },
        ],
      },
      { "given param3" => [] },
    ],
  },
] at d:/tmp/parse_indent.pl line 55, <DATA> line 7.