How to count average ratings in laravel using jquery

I have two table Users and ratings,.A User can give rating to consultant, My Rating table look like below

 User_id | consultant_id | rating
 ---------------------------------      
        1           1        2
 ---------------------------------
        2           1        3
 ---------------------------------
        3           1        1
 ---------------------------------
        4           1        1

This how my table looks like

My controller:

public function searchConsultants(Request $request)
{
         $location = $request->get('location');
         $data = Consultant::where('location','LIKE','%'.$location.'%')->with('ratings')->get();
         return response()->json($data);
}

Im using ajax get method to diplay the data, here is my js file

$.each(data, function(index) {
   str +="<tr><td>"+data[index].id+"</td>
  <td>"+data[index].cunsultant_name+"</td>
  <td>"+data[index].contact_number+"</td>
  <td>"+data[index].ratings[index].rating_for_manager+"</td><td>"+data[index].location+"</td></tr>";
}); 

When I click search consultant button I should get consultant details with average ratings.

via Chebli Mohamed