I managed to add a custom option-select for images with 

    function attachment_field_credit( $form_fields, $post ) {
        $field_value = get_post_meta( $post->ID, 'first_image', true );
        $isSelected1 = $field_value == '1' ? 'selected ' : '';
        $isSelected2 = $field_value != '1' ? 'selected ' : '';
        $form_fields['first_image'] = array(
            'label' => __( 'Use as first image' ),
            'input' => 'html',
            'html' => "<select name='attachments[{$post->ID}][first_image]' id='attachments[{$post->ID}][first_image]'>
                        <option ".$isSelected1." value='1'>Yes</option>
                        <option ".$isSelected2."  value='2'>No</option>
                       </select>"
        );
        return $form_fields;
    }
    add_filter( 'attachment_fields_to_edit', 'attachment_field_credit', 10, 2 );

Now I need to do almost the same for links. So if I click on `Pages -> Add New -> Insert / Edit Link` I get this:

[![enter image description here][1]][1]


Can I add another option-select field for those links? How to do that?

  [1]: https://i.sstatic.net/PtiGa.png