how to get API response in multiple curly braces?

I’m trying to API response in multiple curly braces,
but it’s not coming.
below is my code.

/**
    * @return array
    */
    public function Newdata()
    {   
        //get Customer Order collection by Customer Id and Email Magento 2

        $customerCollection =  $this->_customer->getCollection()
                                               ->addAttributeToSelect("*")
                                               ->load();
        $customeid = $customerCollection->getData('customer_id');    
        
        try {
            //$customerEmailId = "ncode.rushikesh@gmail.com";

            $customerID = $customeid;

            $customerOrder = $this->orderCollectionFactory->create()->addAttributeToFilter('customer_email', $customerID)->load();

            $finalArray = [];            

            if(!empty($customerOrder->getData())){


                foreach ($customerOrder as $item) {  
                      
                    $finalArray[] = $item->getEntityId();                    
                }
                
               //$finalArray['entity_id'] = $customerOrder->getData();

                $response = ['success' => 200, 'message' => 'Success', 'data' => $finalArray];    
            }else{
                $response = ['success' => 404, 'message' => "Data Not Found", 'data' => []];    
            }
        }catch (Exception $e) {
            $response = ['success' => false, 'message' => $e->getMessage(), 'data' => []];
            $this->logger->info($e->getMessage());
        }
        return [$response];
    }
    
}

OUTPUT

[
    {
        "success": 200,
        "message": "Success",
        "data": [
            "1",
            "2",
            "3"
        ]
    }
]

but i need like

[
    {
        "success": 200,
        "message": "Success",
        "data": [
            {"1"},
            {"2"},
            {"3"}
        ]
    }
]

how can i do that?? pls help me on this.