{
  "healthCheck": "success"
}

HealthCheck

@Serializable
data class HealthCheck(
  @SerialName("healthCheck")
  @Serializable(with = StatusSerializer::class)
  val result: Status
) {
  @Serializable
  enum class Status {
    SUCCESS
  }
}

object StatusSerializer : JsonTransformingSerializer<HealthCheck.Status>(HealthCheck.Status.serializer()) {
  override fun transformDeserialize(element: JsonElement): JsonElement {
    val el = super.transformDeserialize(element)

    return JsonPrimitive(el.toString().uppercase())
  }
}

HealthCheck.Status does not contain element with name '"SUCCESS"'

@SerialName("success")

@SerialName("success")

@SerialName("SUCCESS")

with = StatusSerializer::class)