Loop through Categories and its Products in PHP Laravel

I have to create an array with the categories array and its related products i'm fetching category with all related products using this query

  $categoryData= Category::with('product')->get();

Data is beign fetched properly, using this loop to get data in the format given below:

 foreach($categoryData as $row){
            $categoriesData[] = [
                'id' => $row->id,
                'title' =>  $row->title,
            ];
          foreach($row->product as $rowproduct){
            $categoriesData['product_details'][] = [
             'product_name' => $rowproduct->name,
             'product_price' => $rowproduct->price
      ];
}
}

Format (It should be something like this) :

{
    "categoriesData": {
        "0": {
            "id": 1,
            "category_name" : "Name 1",
        "product_details": [
            {
                "id": 1,
                "product_name": Product Name,
            },
        ],
        "1": {
            "id": 2,
            ""category_name" ": "Name 2",
            "product_details": [
            {
                "id": 1,
                "product_name": product name,
            },
        },
      
   

but through present loop all product is getting saved in one array. It is not saving inside category.

Any help is highly appreciated

via Chebli Mohamed