data.json

{
        "name": "TOPICS", "children": [{
            "name": "Topic A",
            "children": [{"name": "Sub A1", "size": 4, "rank": 1}, {"name": "Sub A2", "size": 4, "rank": 1}]
        }, {
            "name": "Topic B",
            "children": [{"name": "Sub B1", "size": 3, "rank": 1}, {"name": "Sub B2", "size": 3, "rank": 1}, {
                "name": "Sub B3", "size": 3, "rank": 1}]
        }, {
            "name": "Topic C",
            "children": [{"name": "Sub C1", "size": 4, "rank": 1}, {"name": "Sub C2", "size": 4, "rank": 1}]
        }, {
            "name": "Topic D",
            "children": [{"name": "Sub D1", "size": 4, "rank": 6}, {"name": "Sub D2", "size": 4, "rank": 6}]
        }, {
            "name": "Topic E",
            "children": [{"name": "Sub E1", "size": 4, "rank": 6}, {"name": "Sub E2", "size": 4, "rank": 6}]
        }, {
            "name": "Topic F",
            "children": [{"name": "Sub F1", "size": 4, "rank": 6}, {"name": "Sub F2", "size": 4, "rank": 6}]
        }, {
            "name": "Topic G",
            "children": [{"name": "Sub G1", "size": 4, "rank": 100}, {"name": "Sub G2", "size": 4, "rank": 100}]
        }, {
            "name": "Topic H",
            "children": [{"name": "Sub H1", "size": 4, "rank": 100}, {"name": "Sub H2", "size": 4, "rank": 100}]
        }]
    }