如何制作大胆的ampiechart标签

Question

http://jsfiddle.net/8JCfg/138/

这是一个示例代码，我想制作切片的粗体标签，即“ddddd” 我已经尝试了几种方式，但似乎没有任何工作，我能够制作大胆的气球文本，标题副标题，但不是切片的标签。请帮忙！

AmCharts.makeChart("chartdiv", {
    "type": "pie",
    "theme": "none",
    "allLabels": [{
        "text": "This is chart title",
        "align": "center",
        "bold": true,
        "y": 220
    },{
        "text": "Ans here's the subtitle as well",
        "align": "center",
        "bold": false,
        "y": 250
    }],
    "dataProvider": [{
        "title": "New",
        "value": 4852
    }, {
        "title": "Returning",
        "value": 9899
    }],
    "titleField": "title",
    "valueField": "value",
    "labelRadius": -130,
    "radius": "42%",
    "innerRadius": "60%",
    "labelText": "ddddd",
    "bold":true
});