I'm writing a reusable font property, as described here and here. Here's my property

property font button2: Qt.font({
    family: defaultFont.name,
    styleName: "Bold",
    pointSize: 16
})

and here it how I use it, and it works fine

    Text {
        text: "button"
        font: MyFont.button2
    }

Now I would add the capitalization but adding it to the property like this

property font button2: Qt.font({
    family: defaultFont.name,
    styleName: "Bold",
    capitalization: "AllUppercase",
    pointSize: 16
})

It does not have effect at all. If I add it in the text component instead

    Text {
        text: "button"
        font: MyFont.button2
        font.capitalization: Font.AllUppercase
    }

it gives me a "Property has already been assigned a value" error.

How should I do that?