Compile error while returning chunked response from play 2.8.18

I am trying out chunked response in play framework.
The below controller code works fine.

def chunkedSample = Action {
  val source = Source.apply(List("Hello","Hai"))
  Ok.chunked(source)
}

But when I change the List object to a case class as below

def chunkedSample = Action {
  val source = Source.apply(List(Dummy("hello")))
  Ok.chunked(source)
}

Where I define dummy case class as below

case class Dummy(hello:String)

I get below compilation error
No implicit found for parameter writable:Writable[Dummy]
I tried putting json format & writes in companion object below but didn't work.

object Dummy{
  implicit val write = Json.writes[Dummy]
}

The error tells you that you are missing writes, so you need to add them. There are different ways to add them, but for case class I find next example as most convenient. It also has read as you will most probably need it in the future.

case class Dummy(hello: String)
implicit lazy val dummyReads: Reads[Dummy] = (
  (__ \ "hello").read[String]
)(Dummy)
implicit lazy val dummyWrites: Writes[Dummy] = (
  (__ \ "hello").write[String]
)(unlift(Dummy.unapply))

More documentation could be found on this page of Play framework official docs.