I am having issues concatenating two JSON values to perform a !contains in my Karate Scenario, if I run the match for each field individually it works

def concatField = 
{'#(responseartikel[].Kurztext_1 + responseartikel[*].Kurztext_2)'}

match concatField !contains expected

*But I get an error: "net.minidev.json.parser.parseexception unexpected character ( })" at position 66."

Is there another way to define this concatenated field without writing a java utility?*