Hook for get_formatted_line_subtotal

I am trying to hook the function for get_formatted_link_subtotal in my plugin.

The template is /plugins/woocommerce/templates/order/order-details-item.php

on line 44

echo $order->get_formatted_line_subtotal( $item );

here is the documentation http://woocommerce.wp-a2z.org/oik_api/wc_abstract_orderget_formatted_line_subtotal/

i would like to add a hook in my plugin, to set the second parameter to true so as to exclude the tax.

get_formatted_line_subtotal( $item, $tax_display = true )

Thanks