Play Json vs Circe simple validation with error accumulation and no auto-derivation

a.scala

case class Data(s: String, i: Int)
object Circe {
  import io.circe._
  import cats.implicits._
  
  implicit val decoder: AccumulatingDecoder[Data] = (
    Decoder[String].prepare(_.downField("s")) |@|
    Decoder[Int].prepare(_.downField("i"))
  ).map(Data.apply)
   .accumulating
}
object PlayJson {
  import play.api.libs.json._
  import play.api.libs.functional.syntax._

  implicit val reads: Reads[Data] = (
    (__ \ "s").read[String] ~
    (__ \ "i").read[Int]
  )(Data.apply _)
}