Laravel maatwebsite excel export cell inside another cell

    $libraries = $request->librarylists;
    $stockArray = [];
    $orderlists = CODOrder::whereIn('library_id', $libraries)->get();
    foreach($orderlists as $sale)
    {
        $orderDetail = CODOrderDetails::where('order_id', $sale->id)->get();
        $temp = [];
        $tempbooks = [];
        $temp['payment_mode'] = $sale->payment_type;
        $add = json_decode($sale->address, true);
        $temp['customer_name'] = $add['customername'];
        $temp['customer_phone'] = $add['customerphone'];
        foreach($orderDetail as $orderDetails)
        {
            $tempbooks['bookdiscount_Amount'] = $orderDetails->discount;
            $tempbooks['bookfinal_Amount'] = $orderDetails->total;
            $tempbooks['Books'] = $orderDetails->getBook->title . '-' . $orderDetails->quantity;
            $tempbooks['Hardcopy_Amount'] = $orderDetails->selling_price;

            $temp['bookdetails'][] = $tempbooks;
        }
        $stockArray[] = $temp;
    }
    return Excel::download(new LibraryOrderExport($stockArray), 'LibraryData.xlsx');

Here I want to export some order details based on a specific library.

I try to avoid duplicate entry's, so the main row only shows the common order details.

Each row have its on order details, so i want to display the all order details inside a Order Details cell.

class LibraryOrderExport implements FromCollection, WithHeadings, ShouldAutoSize
{
    /**
    * @return \Illuminate\Support\Collection
    */

    protected $data;

    public function __construct($data)
    {
        $this->data = $data;
    }

    public function collection()
    {
        return collect($this->data);
    }

    public function headings() : array {
        return [
            'Payment Mode',
            'Customer Name',
            'Customer Phone',
            'Order Details'
        ];
    }

    public function title(): string
    {
        return $this->title;
    }
}