CakePHP 3 how to limit number on items in contain per item not globally

I have articles connected with categories. I would like to get at most two articles for each category. There is many to one connection. So I use the following.

$query = $categories->find()->contain([      'Articles' => [          'queryBuilder' => function ($q) {              return $q->limit(2);           }      ]  ]);

Unfortunately the limit 2 seams to be global. I get 2 articles from the first category an then no articles connected with other categories.

How can I set the limit per item and not globally.

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