title: How to use Timestampable in a Trait with Platform API groups
body: <p>Now i have a lot of entities with:</p>
  <pre><code>#[ORM\Column(type: 'datetime')]
  #[Groups(['article_category:output'])]
  /**
   * @Timestampable(on=&quot;create&quot;)
   */
  private \DateTime $createdAt;
  
  public function getCreatedAt(): \DateTime
  {
      return $this-&gt;createdAt;
  }
  </code></pre>
  <p>And i want to put it inside Trait.
  But each entity has its own normalization group (like 'article_category:output').
  How can I make this field always available from the API Platform?</p>