https://www.prim.es/wp-content/uploads/visualizer/customization.js

1// user specific customizations
2(function ($) {
3    $(document).ready(function(){
4        $('body').on('visualizer:format:chart', function(event, data){
5            customize_format(data.id, data.data, data.column);
6        });
7    });
8
9    function customize_format($id, $data, $column) {
10/* example add green/red arrows to the specified column of the specified chart
11        if($id === 359 && $column === 1) {
12            var formatter   = new google.visualization.ArrowFormat();
13            formatter.format($data, $column);
14        }
15*/
16    }
17})(jQuery);