Chunk reading into array in laravel mathwebsite

I have been using laravel mathwebsite package version 3.1. I want to read file in chunks like i have

$collection = Excel::toArray(new ImportableClass, $file, '', \Maatwebsite\Excel\Excel::XLSX);

But it loads all the file data into array which returns out of memory exception. I want to read this file in chunks like in older version of 2.1. Please help me out. Thanks

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