How to return resource without wrapping each row in curly braces

Hi,

I have a table called user_metadata which may contain many rows for a user. I have created an end point that returns all data for a user in the controller:

/**
 * @return JsonResponse
 */
public function index(): JsonResponse
{
    return $this->generateResponse(UserMetadataResource::collection(UserMetadata::where('user_id', request()->input('user_id'))->get()), 200);
}

Here is my UserMetadataResource:

class UserMetadata extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param Request $request
     * @return array
     */
    public function toArray($request): array
    {
        return [
            $this->name => $this->value
        ];
    }
}

And this is the response:

{
    "status": 200,
    "data": [
        {
            "data_item_1": "Value 1"
        },
        {
            "data_item_2": "Value 2"
        },
    ],
    "message": "success"
}

How can I update the response so that it is returning all rows as one object rather than an array of objects?