Camunda Form - how to dynamically populate Select Widget from the data set on the server

We have started using Camunda Forms. We would like to dynamically populate options for a dropdown menu that the Select widget offers.

We have created a form like this:

We would like to dynamically populate the options by setting the variable “dynamic” in the code.

@Component
public class TestDelegate implements JavaDelegate {
@Override
public void execute(DelegateExecution delegateExecution) {
Object whatToPass = new Object();
delegateExecution.setVariable(“dynamic”, whatToPass);

}

}

We have tried passing JSONs, Strings but we did not succeed.