How to concatenate 2 values in StringBody in Gatling version 3.5.0

Question

I need to concatenate 2 variables in StringBody in a Gatling script. If I type only one value for example:

"code":"${executionRef}",
"name":"${Groups}",

that works. But I need to concatenate them in only one value. I have tried it in many ways but the scripts fails. Some of my attempts:

Answer 1

"""{
  "code":"#{Groups}-$#{executionRef}"
}"""

Note: using the new #{} syntax introduced in Gatling 3.7, where old ${} is deprecated