Hi, Alan Rep

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

- Here is a callback you can use, we have tested it on our local environment, and it works on HighCharts; you just have to change [16] to your chart ID, if that makes sense :

<script type="text/javascript">
jQuery(window).on('load',function(){
  if( typeof wpDataChartsCallbacks == 'undefined' ){ wpDataChartsCallbacks = {}; }
  wpDataChartsCallbacks[16] = function(obj){
    obj.options.plotOptions = {
      bar: {
           dataLabels: {
            enabled: true
           }
      }
    };
  };
});
</script>

Here is a more detailed page about general use of wpDataCharts callbacks - https://wpdatatables.com/documentation/information-for-developers/wpdatacharts-callbacks/

If you need more details and guidance for this, please contact us further. Thanks.