I cant able to send OML I am using latest version of outsystems Charts 

I want to show the value in the parent screen not in  block level

I prepared a sample OML.

You need to create a client action and an event in the block. In my example, I called the client action SetHoveredValue. This action should have an input parameter called Value of type Integer. Inside the action, call the block event and pass the Value input to it.

You will use this event to send the hovered value from the block to the screen.

On the screen, create another client action to handle the event value and assign it to a local variable.

Then, in the block, add the JavaScript in the chart’s OnInitialize event. Just make sure the action name in the JavaScript matches the client action you created.

1. (function () {
2.     var chartWidgetId = $parameters.ChartWidgetId;
3. 
   
4.     var chartEventConfig = {
5.         plotOptions: {
6.             series: {
7.                 point: {
8.                     events: {
9.                         mouseOver: function () {
10.                             $actions.SetHoveredValue(this.y);
11.                         }
12.                     }
13.                 }
14.             }
15.         }
16.     };
17. 
    
18.     var chart = OutSystems.ChartAPI.Chart.GetById(chartWidgetId);
19. 
    
20.     chart.provider.update(chartEventConfig, true, true);
21. })();

You can check the full implementation in the attached OML.