sulu CMS admin ui not showing data

i'm trying display the list from the controller, all the routes are loading but the data is not displaying

    #[Route(path: '/admin/api/products', methods: ['GET'], name: 'app.get_products')]
    public function index(ManagerRegistry $doctrine): Response
    {
        $products = $doctrine->getRepository(Product::class)->findAll();   

        if (!$products) {
            return $this->json('No product found');
        }

        $data = [
            '_embedded' => [
                'products' => $products
            ]
        ];
   
        return $this->json($data);
    }

enter image description here

<?xml version="1.0" ?>
<list xmlns="http://schemas.sulu.io/list-builder/list">
    <key>products</key>
    <properties>
        <property name="id" visibility="no" translation="sulu_admin.id">
            <field-name>id</field-name>
            <entity-name>App\Entity\Product</entity-name>
        </property>

        <property name="Product" visibility="always" searchability="yes" type="string">
            <field-name>Product</field-name>
            <entity-name>App\Entity\Product</entity-name>
        </property>
        
        <property name="item_number" visibility="always" type="string">
            <field-name>ItemNumber</field-name>
            <entity-name>App\Entity\Product</entity-name>
        </property>

        <property name="quantity" visibility="always" type="integer">
            <field-name>quantity</field-name>
            <entity-name>App\Entity\Product</entity-name>
        </property>
    </properties>
</list>

I tried to use DoctrineRepresentational factory but shows undefined.

Is there something that I'm missing?

You might want to check the Sulu Workshop repository and step through the different Pull Requests to follow along. That helped me when developing my first custom entities: https://github.com/sulu/sulu-workshop/pulls

For example, the Sulu people use a custom DoctrineListRepresentationFactory class which returns a PaginatedRepresentation via a DoctrineListBuilder. I would assume your code does not work because the JSON response does not match what Sulu Admin is expecting.