Thanks for your help Michael. But unfortunately it does not work.
I placed the new segment into the child’s functions.php and received immediately the following error (using live preview):
Parse error: syntax error, unexpected ‘name’ (T_STRING), expecting ‘,’ or ‘;’ in /homepages/39/d158355682/htdocs/wp-content/themes/oria-child/functions.php on line 18
I’m not quite sure how to fix it, sorry.