Stanislav QQ

function ant_page_reviews_jam_theme() {
  return [
      'page_theme' => [
          'arguments' => array('result' => NULL),
          'template' => 'page-theme-template',
      ],
  ];
}

function ant_page_reviews_jam_callback() {
  $someData = [];
  return theme('page_theme', ['someVar' => $someData]);
}