Feature request: equal filling or stretch factors

Can we have a simple way to make items grow equally regardless of their implicit sizes?

Especially in mobile/embedded, it's very common to have the same size for each button/control in a row to make them align with other content.

RowLayout {
    width: parent.width / 2
    Button {
        text: "OK"
        Layout.fillWidth: true
    }
    Button {
        text: "Cancel"
        Layout.fillWidth: true
    }
}