display more level subItem

[KarasuShin]

I want to display more level children like tree selector

{
  label: '1',
  value: 1,
  children: [
    {
      label: '1-1',
      value: 2,
      children: [
        {
          label: '1-1-1',
          value: 3,
          children: ...
        },
        {
          label: '1-1-2',
          value: 4,
        },
      ],
    },
  ],
}