import QtQuick

Window {
    id: root
    width: 640
    height: 480
    visible: true

    Column {
        Text {
            text: qsTr("Width: %1 Height: %2").arg(root.width).arg(root.height)
        }
        Text {
            text: qsTr(`Width: ${root.width} Height: ${root.height}`)
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE TS>
<TS version="2.1">
<context>
    <name>Main</name>
    <message>
        <location filename="Main.qml" line="11"/>
        <source>Width: %1 Height: %2</source>
        <translation type="unfinished"></translation>
    </message>
    <message>
        <location filename="Main.qml" line="14"/>
        <source>Width: </source>
        <translation type="unfinished"></translation>
    </message>
</context>
</TS>