1.位置

数据存在name属性
https://blog.csdn.net/woteafuck/article/details/91986313
https://www.cnblogs.com/sxh24/p/11576479.html

legend: {
      orient: 'vertical',
      icon: 'rect',
      itemHeight: 18,
      itemWidth: 18,
      align: 'left',
      x: 'right',      //可设定图例在左、右、居中
      y: 'center',     //可设定图例在上、下、居中
      padding: [0, 100, 0, 0],   //可设定图例[距上方距离，距右方距离，距下方距离，距左方距离]
      textStyle: {
        fontSize: 18,
        color: '#fff'
      },
    },

2.文字位置

https://www.cnblogs.com/PHP0222wangdong/p/11398204.html

3.形状

https://blog.csdn.net/qq_31201781/article/details/89843628