Turn off template suggestion for specific fields
As it seems, that there is no solid alternative that works for field values I have written a Twig-Filter which returns the value via this php function:

public function removeHtmlComments($string) {

  $output = preg_replace(array('/&lt;!--(.|\s)*?--&gt;\s*/', '/\t+/', '/\n+/', '/[\r\n]/', '/[\n\r]/'), '', $string);

  return $output;
}