How can I Define an Async Action in c#?

Question

I really want to know if there is a way to define action variables async? Or some alternative method?

public System.Action myAction;

public async System.Action myAsyncAction;
void Start()
{
    // normal action
    myAction += () =>
    {
        Debug.Log("Inject some code in runtime..");
    };

    // I want something like this that support wait time..
    myAsyncAction += () =>
    {
        await Task.Delay(2000f);
        
        Debug.Log("Inject some code in runtime..");
    };
}

Answer 1

I've used Func<Task> in the past. EG:

Func<Task> asyncMethod = async () =>
{
    await Task.Delay(1000);
    Console.WriteLine("done here");
};

await asyncMethod();