Create chart with top values using Qlik Sense visualization API

visualization_create_top.js

app.visualization.create( 'barchart',
    [{
      qDef: {qFieldDefs: ["Case Owner Group"]},                          //dimension field
      qOtherTotalSpec: {qOtherMode: "OTHER_COUNTED", qOtherCounted: "5"} //top 5 values    
     },
     "=Avg([Case Duration Time])"],   //measure
    {"title": "On the fly chart"}
).then( function ( barchart ) {
   barchart.show( 'QV01' );
} );