Hi @rezza72,
the easiest way is to use a task listener on the create event and use the name attribute of the provided task object.
For example:
<bpmn:userTask id="Activity_02328bn" name="${taskTitle}" camunda:assignee="${prc_starter_user_uri}">
<bpmn:extensionElements>
<camunda:taskListener event="create">
<camunda:script scriptFormat="javascript">task.setName("Hallo Rezza");</camunda:script>
</camunda:taskListener>
</bpmn:extensionElements>
</bpmn:userTask>
To add additional logic, surround the statement with if-then-else. And choose the scripting language (or Java) you like most.
Hope this helps, Ingo