AsyncReactiveProperty construction without value or without notifying

[Maesla]

Hello,

I have this approach:

Producer

    public IReadOnlyAsyncReactiveProperty<Foo> FooObject=> fooObject ;
    private AsyncReactiveProperty<Foo> fooObject =  new AsyncReactiveProperty<Foo>(null);

Consumer

        await foreach(var item in provider.FooObject)
        {
            Debug.Log(item);
        }

My problem is that the first element that I am going to produce will take a while, but I have to create the AsynReactiveProperty, so I create it with null value.
So, the consumer, instead of waiting and getting the first real value, is getting at the beginning null, because it's the defined value.
I can handle this in two ways in the consumer, checking for null, or using WithoutCurrent in the property.
But for me, both solutions are antipattern, because the consumer has to know too much about the producer, I.E, it needs to know that the first value is not valid, which in this case is not a design decision but an implementation issue.

IMHO, a better solution would be to create the property without any value, some kind of lazy creation.

Is that possible? Is there maybe other approach?

Thanks