dart - 冻结包中是否有任何“初始化程序列表”？

Question

如果Strig? id是null，我想为它分配一个uuid或随机int（作为字符串）。

@freezed
 class Todo with _$Todo {
 const factory Todo({
    @Default(false) bool isComplete,
    String? id,
    required String title,
    required String todo,
  }) = _Todo; ```


In vanila Constructor, I could to it in Initializer list.