How to setup ContentType for Azure ServiceBus from Spring JMS

I'm trying to use library azure-servicebus-jms-spring-boot-starter to send messages to topic. Everything works, however messages are being stored in subscriptions as application/xml type and I can't find the way how to setup this correctly to have them stored as application/json. I've tried to configure message converter to send ContentType as described here but that doesn't work either.

  @Bean
  public MessageConverter jacksonJmsMessageConverter() {
    final MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter(){
      @Override
      protected TextMessage mapToTextMessage(Object object, Session session, ObjectWriter objectWriter)
          throws JMSException, IOException {
        final TextMessage message = super.mapToTextMessage(object, session, objectWriter);
        message.setStringProperty("ContentType", "application/json");
        return message;
      }
    };
    converter.setTargetType(MessageType.TEXT);
    converter.setTypeIdPropertyName("_type");
    converter.setObjectMapper(objectMapper);
    return converter;
  }