How to pass csv feeder value as a parameters to function call

we are using csv feeder to fetch the string and that will be manipulated based on the user in payloadBuilder2 function and then it will return perfect payload.

  // session => {
//     messageModified = session("message").as[String]
    kafka("Kafka_Producer_WorkflowCaller") .send("performance",kafkaCaller.payloadBuilder2(session =>session("message").as[String]))
//   session
//  }

This kafka plugin is a third party, not an official component developed and maintained by Gatling.
You’re unlikely to get an answer here.
You should reach out to its authors on their own bugtracker.