ChartJs with server side data

Question

hii all

i have below json data from web api

[{"DepartmentName":"HR","Performance":[30,40],"Month":["Jan","feb"]},{"DepartmentName":"Dev","Performance":[60,80],"Month":["Jan","feb"]}]

 I need to show a bar chart.

Each department's paerformance each month as shown in below figure

 

i am stuck on generating different series 

$(function(){
       $.ajax({
           type: "POST",
           url: "/ChartJS/ThreeChart",
           contentType: "application/json; charset=utf-8",
           dataType: "json",
           success: function (chData) {
               var ctx = document.getElementById('myChart').getContext('2d');
               var myChart = new Chart(ctx, {
                   type: 'bar',
                   data: [{
                       label: "??",
                       data: chData[1], ??

                   }]
               });

           }

       })


   })

 kindly , suggest me a robust solution.