How to add myCustomTask in isLabelExternal?

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1

I have a custom task node. How to make it show the external label?

// bpmn-js/lib/util/LabelUtil.js
/**
 * Returns true if the given semantic has an external label
 *
 * @param {BpmnElement} semantic
 * @return {boolean} true if has label
 */
export function isLabelExternal(semantic) {
  return is(semantic, 'bpmn:Event') ||
         is(semantic, 'bpmn:Gateway') ||
         is(semantic, 'bpmn:DataStoreReference') ||
         is(semantic, 'bpmn:DataObjectReference') ||
         is(semantic, 'bpmn:DataInput') ||
         is(semantic, 'bpmn:DataOutput') ||
         is(semantic, 'bpmn:SequenceFlow') ||
         is(semantic, 'bpmn:MessageFlow') ||
         is(semantic, 'bpmn:Group');
}
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