How to delegate Spring Integration Message Payload to Spring Batch Job?

Question

I have an FTP Streaming Inbound Channel Adapter from Spring Integration which produces message with payloads of type InputStream, letting files be fetched without writing to the local file system.

@Bean
@InboundChannelAdapter(channel = Constants.CHANNEL_INBOUND_FTP_ADAPTER, poller = @Poller(fixedDelay = Constants.FIXED_POLLING_FROM_INBOUND_FTP_ADAPTER_DELAY))
public MessageSource<InputStream> ftpMessageSource() {
    FtpStreamingMessageSource ftpStreamingMessageSource = new FtpStreamingMessageSource(ftpRemoteFileTemplate());
    ftpStreamingMessageSource.setRemoteDirectory(ftpConnectionParameters.getRootDir());
    ftpStreamingMessageSource.setFilter(chainFileListFilter());
    ftpStreamingMessageSource.setMaxFetchSize(Constants.INBOUND_ADAPTER_MAX_FETCH_SIZE);
    return ftpStreamingMessageSource;
}

After I transform with

@Bean
@org.springframework.integration.annotation.Transformer(inputChannel = Constants.CHANNEL_INBOUND_FTP_ADAPTER, outputChannel = Constants.CHANNEL_STREAMED_DATA)
public Transformer transformer() {
    return new StreamTransformer(Charset.defaultCharset().name());
}

Then handle data to check it works and maybe for custom inteceptors for future:

@ServiceActivator(inputChannel = Constants.CHANNEL_STREAMED_DATA, outputChannel = "BATCH_ALARM_CHANNEL")
public Message<?> alarmHandler(Message<?> message) {
        System.out.println(Constants.CHANNEL_ALARM);
        System.out.println(message.getHeaders());
        return message;
}

After this according to official Spring Batch Integration documentation I have one more Transformer which let us transform to JobLaunchRequest

@Transformer
public JobLaunchRequest toRequest(Message<File> message) {
    JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();
    jobParametersBuilder.addDate("dummy", new Date());
    return new JobLaunchRequest(job, jobParametersBuilder.toJobParameters());
}

Here we have Message from last BATCH_ALARM_CHANNEL which needs in Spring Batch Jobs, but JobParametersBuilder doesn't allow to put complex object only primitive types. So how I can pass message payload for JobLaunching and do the rest of the work such as read, parse and save to DB?