umi block add --path 不会寻找父路由插入

[chenshuai2144]

[
  {
    path: "/dashboard",
    name: "dashboard",
    icon: "dashboard",
    routes: []
  }
]

现有路由，运行
umi block add https://github.com/ant-design/pro-blocks/tree/master/Analysis --npm-client=cnpm --path=/dashboard/analysis

期望行为

[
  {
    path: "/dashboard",
    name: "dashboard",
    icon: "dashboard",
    routes: [
      {
        name: "analysis",
        path: "/dashboard/analysis",
        component: "./dashboard/analysis"
      }
    ]
  }
];

实际行为

[
  {
    name: "analysis",
    path: "/dashboard/analysis",
    component: "./dashboard/analysis"
  },
  {
    path: "/dashboard",
    name: "dashboard",
    icon: "dashboard",
    routes: []
  }
];