Conversion from async lambda Action into Func<Task>?

We know the async equivalent of Action is Func<Task>.

Therefore we could write:

Func<Task> func = async () =>
        {
            Console.WriteLine(@"waiting ...");
            await Task.Delay(300).ConfigureAwait(false);
            Console.WriteLine(@"... finished");
        };

But it is also possible to write it as an Action:

Action action = async () =>
        {
            Console.WriteLine(@"waiting ...");
            await Task.Delay(300).ConfigureAwait(false);
            Console.WriteLine(@"... finished");
        };

This is syntactically correct. How is it possible to convert Action action into Func<Task> func?