我需要将嵌套的json合并到dart flutter中的简单json。

Map<String, dynamic> simpleJson = {
  "name": "John Doe",
  "age": 25,
  "email": "johndoe@example.com"
};

Map<String, dynamic> nestedJson = {
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  },
  "phone": {
    "home": "123-456-7890",
    "work": "987-654-3210"
  }
};

simpleJson.addAll(nestedJson);

import 'dart:convert';

void main() {
  Map<String, dynamic> simpleJson = {
    "name": "John Doe",
    "age": 25,
    "email": "johndoe@example.com"
  };

  Map<String, dynamic> nestedJson = {
    "address": {
      "street": "123 Main St",
      "city": "New York",
      "country": "USA"
    },
    "phone": {
      "home": "123-456-7890",
      "work": "987-654-3210"
    }
  };

  simpleJson.addAll(nestedJson);

  String mergedJson = jsonEncode(simpleJson);
  print(mergedJson);
}

{
  "name": "John Doe",
  "age": 25,
  "email": "johndoe@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  },
  "phone": {
    "home": "123-456-7890",
    "work": "987-654-3210"
  }
}