More options for page--node--edit.html.twig for content type
What you are looking for is called theme suggestions you can implement your own or alter existing ones. In this case since the theme hook is provided by another module (core) you need to alter the provided suggestions and add your own.

Check this post with useful examples. Also core's always have excelent examples (Bartik theme example).

/**
 * Implements hook_theme_suggestions_HOOK_alter() for form templates.
 */
function bartik_theme_suggestions_form_alter(array &amp;$suggestions, array $variables) {
  if ($variables['element']['#form_id'] == 'search_block_form') {
    $suggestions[] = 'form__search_block_form';
  }
}