How to fill form joget from other database by API JSON in V3

Hi,

I want to fill a joget form from an an application web by javascript ou JSON. How i can do that ?

Seconde question, this code was working in V2 but it does not work in v3. Any idea ?import org.joget.workflow.model.service.*;

WorkflowManager wm = (WorkflowManager) pluginManager.getBean("workflowManager");
wm.activityVariable(workflowAssignment.getActivityId(), "variableId", "variableValue");

Thank's