Checkout Custom Question

so i was able to get a custome field placed on the checkout page and it works fine.
i was also able to place the answer on to the order edit as well
Now only problem is i cant get the answer from customer to print on the PRINT INVOICE.

Is there a way to get the answer on the printed paper using Print Invoice button

here is the code i used

/**
 * Add the field to the checkout
 */
add_action( 'woocommerce_after_order_notes', 'my_custom_checkout_field' );

function my_custom_checkout_field( $checkout ) {

    echo '<div id="my_custom_checkout_field"><h2>' . __('Delivery Day Preference') . '</h2>';

    woocommerce_form_field( 'my_field_name', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('What delivery day works best for you?'),
        'placeholder'   => __('Wednesday/Thursday/Friday or any combination of these 3 days'),
        ), $checkout->get_value( 'my_field_name' ));

    echo '</div>';

Print Invoices & Delivery Notes for WooCommerce Orders.

Version 4.6.4 | By Tyche Softwares