如何将一个数组中的元素，填入到另一个数组内

Question

例如现有两数组 arr和arry

const arr = [
0:{children:[a:{name:xiaoming,age:8},b:{name:xiaohong,age:13}],flag:false,...},
1:{children:[a:{name:wanggang,age:32},b:{name:liming,age:20}],flag:true,...}
]

const arry = [
0:{list:[a:{name:xiaoming,id:3},b:{name:xiaohong,id:10}],flag:false,...},
1:{list:[a:{name:wanggang,id:22},b:{name:liming,id:7}],flag:true,...}
]

如何将数组arry中的list内的id填入到arr数组的children中，不创建新的数组，请问如何操作数组非常感谢