1. Create a Qt Quick 1 Application and configure it with Qt 4.
2. Add some JavaScript to main.qml.
   I used:

   import QtQuick 1.1
   
   Rectangle {
       width: 360
       height: 360
       Text {
           text: qsTr("Hello World")
           anchors.centerIn: parent
       }
       Timer {
           interval: 2000
           repeat: true
           running: true
           onTriggered: {
               var i;
               for (i = 1; i < 2500; ++i) {
                   var j;
                   j = i * i;
                   console.log(j);
   
               }
           }
       }
   
       MouseArea {
           anchors.fill: parent
           onClicked: {
               Qt.quit();
           }
       }
   }
   

3. Build this and run it in QML Profiler.
   On its JavaScript tab, the QML Profiler will display one line of data, whereas the tooltip of this tab reads that this is only available with Qt 5:
   

Found by Squish test tst_simple_analyze.