Attaching the sample OML File with the solution implemented.
Implementation Details:
OutSystems Charts uses the Highcharts API, you can customize and change your Chart by using Highcharts configuration options. These configuration options are defined as JSON snippets and can be used in the AdvancedFormat > HighchartsJSON field of a Chart.
OutSystems Reference: https://success.outsystems.com/Documentation/11/Reference/OutSystems_APIs/Charts_API#Structure_AdvancedFormat
To apply the configuration to the donut charts, please update the HighchartsJSON field of a Donut Chart with the below JSON code.
"plotOptions:
{
series:
{
dataLabels:
{
enabled: true, // enable DataLabels
format: '{point.name}: {y}', // format to replicatte Traditional Web labels
}
},
}"