圆环的视觉引导线怎么控制？echarts 配置项内容和展示

圆环的引导线怎么控制？让引导线平均分两边，而且起点都在中心线上

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    title: {
        text: '圆环的视觉引导线怎么控制？'
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        hoverAnimation: !1,
        startAngle: 90,
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        name: "3",
        type: "pie",
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        startAngle: 90,
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