Syntax Support for Async Binding to Self

[djdjz7]

Is your feature request related to a problem? Please describe.

As mentioned in #16092 , the following syntax does not work:
code-behind:

private List<Task<Bitmap?>> _illustrations = new();
public List<Task<Bitmap?>> Illustrations
{
    get => _illustrations;
    set => this.RaiseAndSetIfChanged(ref _illustrations, value);
}

axaml:

<Image Source="{Binding ^}" />

or

<Image Source="{Binding .^}" />

In 11.0.11, the first syntax throws compiler errors, while the second one downloads the image, but didn't display it in the UI.

In 11.1-rc, both syntaxes throws compiler errors.

Describe the solution you'd like

Add support for either syntax. Personally I would prefer the first one, as it is more concise, and is similar to the {Binding} syntax.

Describe alternatives you've considered

No response

Additional context

No response