API return writeable

I'm trying to convert a few endpoints I have to use concurrency. I have the following method for the controller:

Original method

def getHistory(id:String) = Action {
  val response = historyService.getPersonHistory(id)

  Ok(write(response)) as "application/json"
}

New Method

def getHistory(id:String) = Action.async {
    val response = scala.concurrent.Future {
        historyService.getPersonHistory(id)
    }

   response.map(i => Ok(i))

}

So, when we try this with a simple example process (not calling another method, but just calculating an Int) it seems to work. In the new version above, I keep getting the error:

"No implicits found for parameter writable: Writeable[historyResponse]

Cannot write an instance of models.HistoryResponse to HTTP response. Try to define a Writeable[models.HistoryResponse]"

I'm new to Scala, and having difficulty finding information on making writeables. What do I need to be able to return the results as before?

Thanks