give-custom-subtitle-field.php

<?php

/**
 * @param $value
 * @param $option_value
 */
function my_custom_subtitle( $value, $option_value ) {
    ?>
    <tr>
      <th scope="row" class="titledesc" colspan="2">
        <h2><?php _e( $value['name']; ?></h2>
      </th>
    </tr>
    <?php
}
add_action( 'give_admin_field_my_custom_subtitle', 'my_custom_subtitle', 10, 5 );