方式1

这个方法不可以选中省会

{
  ...item,
  geometry: {
    type: 'Polygon',
    zoom: 99999999999,
    coordinates: [
      [
        [item.geometry.coordinates[0], item.geometry.coordinates[1] + 0.1],
        [item.geometry.coordinates[0] + 0.022452, item.geometry.coordinates[1] + 0.030902],
        [item.geometry.coordinates[0] + 0.095106, item.geometry.coordinates[1] + 0.030902],
        [item.geometry.coordinates[0] + 0.036328, item.geometry.coordinates[1] + 0.011804],
        [item.geometry.coordinates[0] + 0.058779, item.geometry.coordinates[1] - 0.060902],
        [item.geometry.coordinates[0], item.geometry.coordinates[1] - 0.018197],
        [item.geometry.coordinates[0] - 0.058779, item.geometry.coordinates[1] - 0.060902],
        [item.geometry.coordinates[0] - 0.036328, item.geometry.coordinates[1] + 0.011804],
        [item.geometry.coordinates[0] - 0.095106, item.geometry.coordinates[1] + 0.030902],
        [item.geometry.coordinates[0] - 0.022452, item.geometry.coordinates[1] + 0.030902]
      ]
    ]
  }
}   

方法二

用散点图来标记省会，同时提高散点图的层级，可以选中省会

{
    z: 999,
    zlevel: 999,
    name: 'pm2.5',
    type: 'scatter',
    coordinateSystem: 'geo',
    data: [
      {
        name: '省本级',
        value: [119.290464, 26.103899, 250],
        symbolOffset: [-21, 4]
      }
    ],
    symbol: `image://${require('@assets/images/common/star.png')}`,
    symbolSize: 16,

    encode: {
      value: 2
    },
    
    emphasis: {
      label: {
        show: false
      }
    }
}