json

abstract class AbstractJsonNodeInjection[T] extends JsonNodeInjection[T]
trait CollectionJson extends AnyRef
trait JsonNodeInjection[T] extends Injection[T, JsonNode]
trait LowPriorityJson extends AnyRef
final case class UnparsedJson(str: String) extends AnyVal with Product with Serializable

Value class representing unparsed Json text

object JsonInjection
object JsonNodeInjection extends CollectionJson with LowPriorityJson with Serializable

You need to import all the methods of this object to get general Injection[T,JsonNode] to work
object UnparsedJson extends Serializable