@Override
        protected void configure(ServerBuilder sb) throws Exception {
            sb.annotatedService(new GreetingService(), new ProtobufResponseConverterFunction(
                    JsonFormat.printer().includingDefaultValueFields()));
        }
Given a ProtobufResponseConverterFunction with a custom JsonPrinter configured via the service builder,
the produced JSON should show that the custom JsonPrinter was used.
protobuf/src/test/java/com/linecorp/armeria/server/protobuf/ProtobufResponseAnnotatedServiceJsonArrayTest.java