怎么解决环形图按照绘制路径颜色渐变echarts 饼配置项内容和展示

怎么实现环形图按照绘制的路径进行颜色渐变 而不是按照x y轴进行渐变

       var option = {


     series: [{
         type: 'pie',
         radius: ['80%', '85%'],
         avoidLabelOverlap: false,
         clockwise: false,
         label: {
             normal: {
                 show: true,
                 position: 'center',
                 textStyle: {
                     fontSize: '30',
                     fontWeight: 'bold'
                 }
             },
             emphasis: {
                 show: true,
                 textStyle: {
                     fontSize: '30',
                     fontWeight: 'bold'
                 }
             }
         },

         data: [

             {
                 value: 60,
                 itemStyle: {
                     normal: {
                         opacity: 1,
                         color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{
                             offset: 0,
                             color: 'rgba(232, 9, 9, 1)' // 0% 处的颜色
                         }, {
                             offset: 1,
                             color: 'rgba(232, 9, 9, 0.1)' // 100% 处的颜色
                         }], false)
                     }
                 }

             },

             {
                 value: 60,

                 itemStyle: {
                     normal: {
                         color: '#FFF',
                         opacity: 0.5
                     }
                 }
             }

         ]
     }, {

         type: 'pie',
         radius: ['77%', '87%'],
         avoidLabelOverlap: false,
         clockwise: false,
         label: {
             normal: {
                 show: false,
                 position: 'center',
                 textStyle: {
                     fontSize: '30',
                     fontWeight: 'bold'
                 }
             },
             emphasis: {
                 show: true,
                 textStyle: {
                     fontSize: '30',
                     fontWeight: 'bold'
                 }
             }
         },

         data: [

             {
                 value: 100,

                 itemStyle: {
                     normal: {
                         color: 'red',
                         opacity: 0.1
                     }
                 }
             }

         ]
     }]
 };