How to add placeholder in GenerateAction

Hi, there is a generate method action in my plugin.

I want to add a placeholder to the method I generated, so that users can easily replace these texts.

like this

public $Class$ convertTo$Class$() {
  $Class$ other = new $Class$();
  other.setName(this.name);
  other.setXX(this.xx);
  ...
  return other;
}

Users can replace these "red rectangle" placeholders($Class$) by entering text as soon as the method is generated.

Can anyone give me some advice?

Thanks