How to set "bpmn:TimerEventDefinition" as type of an element?

Currently, when I create this “timer” element its default type is “bpmn:IntermediateCatchEvent”.
But when I go to the eventDefinitions, there is a moddle object, containing a different type - “bpmn:TimerEventDefinition”.
Is there any way to set the timer element’s main type as “bpmn:TimerEventDefinition”?
If I need to create a custom type, could you please explain how?
I went through the example provided, but not sure how to apply it in my project.
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This is in line with the BPMN 2.0 specification (see page 274). Timer Events consist of a base element (e.g., bpmn:StartEvent) and a child TimerEventDefinition.
Example:

    <bpmn:startEvent id="Event_0li3rwq">
      <bpmn:timerEventDefinition id="TimerEventDefinition_0856547" />
    </bpmn:startEvent>

Therefore in bpmn-js you create them following along that structure, example:

 const timerStartEvent = elementFactory.createShape({
    type: 'bpmn:StartEvent',
    eventDefinitionType: 'bpmn:TimerEventDefinition'
  });

Therefore your observation is correct and can not be changed: the main shape has a type like for example bpmn:StartEvent and it has an attribute eventDefinitionType of bpmn:TimerEventDefinition.

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