Thanks for contacting syncfusion support.
We have analyised your query and created a workaround sample for providing the rounding support to datalabels.
The “OnClientDisplayTextRendering” event is used to achieve this.
var num = sender.data.text;
sender.data.text = Math.round(num * 100) / 100;
The datalabel is rounded to 2 decimal places
Please refer the below link for further details on the event
We have attached sample for your reference
As we dont know your version, so we have sent a sample without ej.web.all.min.js in scripts folder.
Please refer the below screenshot and refer the files accordingly
Please let us know if you have any concern