Unable to create abstraction for Json.Format

[enzeart]

I'm trying to create an abstraction to remove some repetitive code from my project. I have some nested case classes for which I am created an OFormat and JsonConfiguration in their companion objects. For my first attempt, I try this:

import play.api.libs.json.{Json, JsonConfiguration, OFormat}
import play.api.libs.json.JsonNaming.SnakeCase
 
trait VariableImplicits1[A] {

  implicit val jsonConfiguration: JsonConfiguration = JsonConfiguration(SnakeCase)

  implicit val jsonFormat: OFormat[A] = Json.format[A]
}

This results in the following error:

play.sbt.PlayExceptions$CompilationException: Compilation error[exception during macro expansion: 
scala.ScalaReflectionException: type A is not a class

I then try the following after looking at the source code for Json.format. This works, but the jsonConfiguration isn't reflected in the output. Is there a way to make this approach work, or am I trying to do something that isn't supported by the library?

import play.api.libs.json.{Json, JsonConfiguration, OFormat}
import play.api.libs.json.JsonNaming.SnakeCase
import scala.language.experimental.macros

trait TerraformVariableImplicits1[A] {

 implicit val jsonConfiguration: JsonConfiguration = JsonConfiguration(SnakeCase)

 implicit def jsonFormat: OFormat[A] = macro JsMacroImpl.implicitConfigFormatImpl[A]
}