Modify rfqtk_get_email_order_items()

I’m trying to achieve two things in the email customer receive upon requesting a quote:

-Use uncropped images

-Add spacing between product’s title and description

I tried to modify that with customer-rfq.php but it seems I need to locate and modify the rfqtk_get_email_order_items() function directly.
So far I tried to modify this part but it did not apply the desired changes:

<?php echo (rfqtk_get_email_order_items($order,array(

        ‘items’ =>$order->get_items(),

        ‘show_sku’ => true,

        ‘show_image’ => $show_image,

        ‘image_size’ => ‘full’, // I tried several things, none worked

        ‘plain_text’ => $plain_text,

        ‘show_prices’ => $show_prices

    ))); ?>

Problem is I cannot locate this function, where could I find it and can I simply copy it to my child-theme/woocommerce/emails/ for it to override ?
Thank you have a nice day