Doctrine - How to show a Collection property and choose which field to get

Question

I have 2 entities User and Post linked with a One-To-Many relationship.

I am writting a query with the queryBuilder to extract needed user details and some info about the posts of the given user :

return $this->createQueryBuilder('u')
            ->select('u.id AS userId, u.username, u.email, u.createdAt, u.roles ')
            ->leftjoin('u.posts', 'p')
            ->select('p.description, p.postPic')
            ->andWhere('u.id = :id')
            ->setParameter('id', $id)
            ->getQuery()
            ->getResult()
        ;

The result is obviously something like that:

[
    {
        "userId": 1,
        "username": "Toto",
        "email": "[email protected]",
        "createdAt": "2024-02-22T16:13:06+01:00",
        "roles": [],
        "description": "super Post from Toto",
        "postPic": "https://images.pexels.com/photos/8159657/pexels-photo-8159657.jpeg"
    },
    {
        "userId": 1,
        "username": "Toto",
        "email": "[email protected]",
        "createdAt": "2024-02-22T16:13:06+01:00",
        "roles": [],
        "description": "another Super Post from Toto",
        "postPic": "https://images.pexels.com/photos/8159657/pexels-photo-8159657.jpeg"
    }
]

but what I would like to reach is:

[
    {
        "userId": 1,
        "username": "Toto",
        "email": "[email protected]",
        "createdAt": "2024-02-22T16:13:06+01:00",
        "roles": [],
        "posts": [
            {
                "description": "super Post from Toto",
                "postPic": "https://images.pexels.com/photos/8159656/pexels-photo-8159656.jpeg"
            },
            {
                "description": "another Super Post from Toto",
                "postPic": "https://images.pexels.com/photos/8159657/pexels-photo-8159657.jpeg"
            },
        ]
    }
]

I am searching a way to show a Collection property like it is when there is no select with createQueryBruilder() but with a select to be able to choose which field to get from the entity.

Does anyone have a suggestion on the best way to do it please?