Use Input Formats within Markup

I would like to see Drupal's Input Formats used so that everything associated with them can be used such as WYSIWYG, etc.

I have changed:

function markup_field_settings_form($field, $instance, $has_data) {
  $form = array();
  $settings = $field['settings'];
  $form['markup'] = array(
    '#type' => 'textarea',
    '#title' => t('Markup'),
    '#default_value' => isset($settings['markup']) ? $settings['markup'] : '',
    ...

to

function markup_field_settings_form($field, $instance, $has_data) {
  $form = array();
  $settings = $field['settings'];
  $form['markup'] = array(
    '#type' => 'text_format',
    '#format' => isset($settings['markup']['format']) ? $settings['markup']['format'] : '',
    '#title' => t('Markup'),
    '#default_value' => isset($settings['markup']['value']) ? $settings['markup']['value'] : '',
    ...

and

function markup_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $element += array(
    'markup' => array(
      '#markup' => $field['settings']['markup'],
    ),
  );
  return $element;
}

to

function markup_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $element += array(
    'markup' => array(
      '#markup' => check_markup($field['settings']['markup']['value'], $field['settings']['markup']['format']),
    ),
  );
  return $element;
}

I don't use git so can't create a patch for this, can this be added into the module?