How to use a json response as a feeder to the scenarios in gatling

Gatling (Open-Source)
1

i have done below to save the json response

val scn = scenario("feeder element")
  .exec(http("get feeder element")
    .get(siteUrl + "/content/ffx/print-authoring/en/newsholes/FNZ/DPT/2016/05/30.cards.html")
    .check(jsonPath("$..pageCards").find.saveAs("json")))
  .exec(session => {
    val response = session.get("json").asOption[String]
    println(response)
    session
  })

now i have “response” which i want to feed in to scenario, something like this

val myfeeder = jsonFile("response")
something...
something...

but don't know what to do next.please help!

Regards