[I] [Feature] series-line.areaStyle. shadowColor 如何使用 [echarts]

[via GitHub]

feilongjump opened a new issue, #19996:
URL: https://github.com/apache/echarts/issues/19996

   ### What problem does this feature solve?
   
   目前 
[series-line.](https://echarts.apache.org/zh/option.html#series-line)[areaStyle.](https://echarts.apache.org/zh/option.html#series-line.areaStyle)
 
[shadowColor](https://echarts.apache.org/zh/option.html#series-line.areaStyle.shadowColor)
 好像仅支持【RGB、RGBA、十六进制格式】这三种
   
   ### What does the proposed API look like?
   
   在文档中 `shadowColor` 说明：支持的颜色同 `color`，但是 `color` 
支持渐变色或者纹理填充，可我实际使用却是一个错误的使用方式，希望以下代码能执行
   ```
   option = {
     xAxis: {
       type: 'category',
       data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
     },
     yAxis: {
       type: 'value'
     },
     series: [
       {
         data: [320, 932, 601, 934, 1090, 1500, 1320],
         type: 'line',
         smooth: true,
         itemStyle: {
           opacity: 0
         },
         lineStyle: {
           color: {
             type: 'linear',
             x: 0,
             y: 1,
             x2: 1,
             y2: 0,
             colorStops: [
               {
                 offset: 0,
                 color: '#f9a8d4' // 0% 处的颜色
               },
               {
                 offset: 1,
                 color: '#22d3ee' // 100% 处的颜色
               }
             ],
             global: false // 缺省为 false
           },
           width: 3,
           cap: 'round',
           shadowBlur: 30,
           shadowOffsetY: 5,
           shadowColor: {
             type: 'linear',
             x: 0,
             y: 1,
             x2: 1,
             y2: 0,
             colorStops: [
               {
                 offset: 0,
                 color: '#f9a8d4', // 0% 处的颜色
               },
               {
                 offset: 1,
                 color: '#22d3ee', // 100% 处的颜色
               },
             ],
             global: false, // 缺省为 false
           },
         }
       }
     ]
   };
   ```


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