MongoDB合并查询结果的两个数组

{
  "comType": 1,
  "createTime": "2022-01-05 19:44:32",
  "url": "https://..",
  "userList": [
    {
      "userId": "1ef3c51361d290c9017b0a86025c7b1d",
      "completeId": "",
      "completeTime": ""
    },
    .....
  ],
  "users": [
    {
      "_id": "1ef3c51361d290c9017b0a86025c7b1d",
      "name": "aaa",
      "org": "AAA",
      "updateTime": "2022-01-03 10:55:25",
      "avatarUrl": "https://thirdwxb5lw/132",
      "createTime": "2022-01-03 00:27:46",
      "userType": 1
    },
    ...
  ]
}

这是我aggregate lookup查询出来的结果，如何把userList数组和users数组通过userId和_id匹配并合并为一个数组,如：

"completeId": "",
"completeTime": ""
"_id": "1ef3c51361d290c9017b0a86025c7b1d",
"name": "aaa",
"org": "AAA",
"updateTime": "2022-01-03 10:55:25",
"avatarUrl": "https://thirdwxb5lw/132",
"createTime": "2022-01-03 00:27:46",
"userType": 1

求查询语句