How can I replace the default 'Qty' header of an item in Woocommerce with a customized value?

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To replace the default 'Qty' header of an item in Woocommerce with a customized value, you will need to add the following code to your functions.php file:

add_filter( 'woocommerce_quantity_input_args', 'custom_qty_label', 10, 2 );

function custom_qty_label( $args, $product ) {
    $args['label'] = __( 'Custom Label', 'woocommerce' );
    return $args;
}

Replace 'Custom Label' with your desired label. Save the changes and refresh your website to see the updated quantity label.