Alloy AttributedString and Attribute

What is the syntax for listing Attributes and AttributedStrings?

I can only get it to work as titanium classic code.

<Label id="label">
    <AttributedString text="123456789" class="as">
    </AttributedString>
</Label>

".as": {
    text:"This is the text",
    attributes: [
        {
            type: Ti.UI.ATTRIBUTE_FOREGROUND_COLOR,
            value:'#f00',
            range:[0,5]
        }
    ]
}

It'd be really cool to use those <Attribute> tags in xml but I don't know what @attributes to use on those tags.