如何在dart/flutter中将键值对列表推送/插入列表？

import 'dart:collection';

List<Map<String, dynamic>> kvList = [
  {'key1': 'value1'},
  {'key2': 'value2'},
  {'key3': 'value3'}
];

List<Map<String, dynamic>> targetList = [
  {'key4': 'value4'},
  {'key5': 'value5'}
];

targetList.addAll(kvList);

import 'dart:collection';

void main() {
  List<Map<String, dynamic>> kvList = [
    {'key1': 'value1'},
    {'key2': 'value2'},
    {'key3': 'value3'}
  ];

  List<Map<String, dynamic>> targetList = [
    {'key4': 'value4'},
    {'key5': 'value5'}
  ];

  targetList.addAll(kvList);

  print(targetList);
}

[
  {key4: value4},
  {key5: value5},
  {key1: value1},
  {key2: value2},
  {key3: value3}
]