In quarkus/rest-client-reactive, can the 'caused-by' exceptions be thrown, instead of the wrappers?

Question

I'm using quarkus both server and client rest reactive to implement a microservice which calls an upstream api.

<dependency>
  <groupId>io.quarkus</groupId>
  <artifactId>quarkus-resteasy-reactive-jackson</artifactId>
</dependency>
<dependency>
  <groupId>io.quarkus</groupId>
  <artifactId>quarkus-rest-client-reactive-jackson</artifactId>
</dependency>

I want to process BadRequest error from the upstream service and return a different error to my client.

The rest client to the upstream API can throw a org.jboss.resteasy.reactive.ClientWebApplicationException which is 'caused by' the javax.ws.rs.WebApplicationException: (Bad Request, status code 400)

With a ResponseExceptionMapper, the rest client to the upstream API throws javax.ws.rs.ProcessingException which is 'caused by' the exception created by the Mapper.

To handle both cases, I find I must do the following:

Uni.createFrom().item(upstream.getData())
  .onFailure(ClientWebApplicationException.class).transform(e -> e.getCause())
  .onFailure(WebApplicationException.class).transform(this::makeClientSideException)
  .onFailure(ProcessingException.class).transform(e -> e.getCause())
  .onFailure(MyCustomException.class).transform(this::makeClientSideException)

I prefer the caused-by classes directly in my service layer code. Is the following possible? How can I make it so?

Uni.createFrom().item(upstream.getData())
  .onFailure(WebApplicationException.class).transform(this::makeClientSideException)
  .onFailure(MyCustomException.class).transform(this::makeClientSideException)

Thank-you for regarding my question.

FYI: The rest client,

@RegisterRestClient
@RegisterProvider(MyCustomExceptionMapper.class)
public interface upstream {
  Uni<MyData> getData();
}

class MyCustomExceptionMapper extends ResponseExceptionMapper<MyCustomException> {...}