How to export excel data in chunk using Laravel?

Excel::create($file_name, function($excel) use ($app_data,$permit_type) {
    $excel->sheet('Sheet 1', function($sheet) use ($app_data,$permit_type) {
        $sheet->loadView('/reports/_export')->with([
            'vehicle' => $app_data,
        ]);
    });
})->export();

In above code I am simply export data in excel sheet which is working fine but due to large amount of data I am unable to export. So, I want to export this data in chunks but I don't have any idea that how to setup chunk in my code? Please help me.

Thank You

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