Is there any way to directly return the top-level nodes instead of flattening all the nodes?

[daifuyang]

Is there any way to directly return the top-level nodes instead of flattening all the nodes?
this is current data
[
{
"__type": "text",
"__parent": "3",
"__prev": null,
"__next": null,
"__key": "4",
"__text": "人",
"__format": 0,
"__mode": 0,
"__detail": 0
},
{
"__type": "pinyinNode",
"__parent": "1",
"__prev": "2",
"__next": "5",
"__key": "3",
"__first": "4",
"__last": "4",
"__size": 1,
"__format": 0,
"__indent": 0,
"__dir": null,
"__pinyin": "rén"
},
{
"__type": "text",
"__parent": "1",
"__prev": "3",
"__next": "6",
"__key": "5",
"__text": "类已经征服了星辰和大海。",
"__format": 0,
"__mode": 0,
"__detail": 0
}
]
i want to node not has textNode, has any methods？very thanks you help me