test.md

{
    "fields" : [
        {"key": "a", "label": "AA", "sortable": true},
        {"key": "b", "label": "BB"},
        {"key": "c", "label": "CC"}
    ],
    "items" : [
      {"a": "11", "b": "22", "c": "33"},
      {"a": "211", "b": "222", "c": "233"}
    ]
}