API Request body format accepted by form - rest

Question

I build an API with Symfony, so I create a CRUD for an entity, and I import Nelmio Api Doc Bundle for generate a doc with Swagger.
I build POST action with a form, and in the request body, I need to add products relation to the cart I create. So this is the body request I got in my Swagger documentation.
{
"datetime": "2023-02-03T12:54:05.661Z",
"customer": {},
"products": [
{
"id": 0
}
]
}
But this body don't work, only this format is accepted :
"products": [
2, 4
]
Or this one :
"products": {
"a": 2,
"b": 4
}
Can you help me to find the good configuration in my form, for my form can accept the JSON body format :
"products": [
{
"id": 0
}
]
Cart.php
#[ORM\Id]
#[ORM\GeneratedValue]
#[ORM\Column]
private ?int $id = null;
#[ORM\Column(type: Types::DATETIME_MUTABLE)]
private ?\DateTimeInterface $datetime = null;
#[ORM\OneToOne(cascade: ['persist', 'remove'])]
private Customer $customer;
#[ORM\ManyToMany(targetEntity: Product::class)]
private ?Collection $products = null;
(getters and setters...)
CartType.php
->add('products', EntityType::class, [
'class' => Product::class,
'multiple' => true,
'constraints' => [
new NotNull(),
],
])
CartController.php
#[Route('/api/v1/customer/cart', name: 'cart_create', methods: ['POST'])]
public function createAction(EntityManagerInterface $em, Request $request): Response
{
$form = $this->buildForm(CartType::class);
$form->handleRequest($request);
if (!$form->isSubmitted() || !$form->isValid()) {
return $this->respond($form, Response::HTTP_BAD_REQUEST);
}
/** #var Cart $cart */
$cart = $form->getData();
$em->persist($cart);
$em->flush();
return $this->respond($cart);
}