Python decorator-like design pattern for Dart/Flutter?

I'd like to have common try/catch/finally logic in a decorator-like feature that can "wrap" a function or class method. Consider the scenario:

Class MyClass {
  void someMethodA() {
    doSomeInitialWork();
    
    try {
      doSomething();
    } catch (err) {
      throw err;
    } finally {
      doSomeCleanUpWork();
    }
  }

  void someMethodB() {
    doSomeInitialWork();
    
    try {
      doSomethingElse();
    } catch (err) {
      throw err;
    } finally {
      doSomeCleanUpWork();
    }
  }
}

So on and so forth. The unique parts of each method are just the try body. If I have a bunch of methods, some which require the same logic, is there a "nice" way to avoid redundant code?

Ideally it could be syntax like:

@wrapper
void someMethodA() {
  doSomething();
}

@wrapper
void someMethodB() {
  doSomethingElse();
}

MyClassInstance.someMethodA(); // call it like this and the wrapper takes care of everything

but I know those are annotations in Dart and not applicable here.