如何在spring batch中为ItemReader和ItemWriter指定单独的chunkSize？

@Bean
public Step myStep(ItemReader<MyObject> reader, ItemWriter<MyObject> writer) {
    return stepBuilderFactory.get("myStep")
            .<MyObject, MyObject>chunk(10) // 指定ItemReader和ItemWriter的chunkSize为10
            .reader(reader)
            .writer(writer)
            .build();
}

public class MyItemReader implements ItemReader<MyObject>, ItemStream {
    private int chunkSize;

    @Override
    public void open(ExecutionContext executionContext) throws ItemStreamException {
        // 从executionContext中获取之前设置的chunkSize
        chunkSize = executionContext.getInt("chunkSize");
    }

    @Override
    public void update(ExecutionContext executionContext) throws ItemStreamException {
        // 将当前chunkSize保存到executionContext中
        executionContext.putInt("chunkSize", chunkSize);
    }

    // 其他方法省略...
}

public class MyItemWriter implements ItemWriter<MyObject>, ItemStream {
    private int chunkSize;

    @Override
    public void open(ExecutionContext executionContext) throws ItemStreamException {
        // 从executionContext中获取之前设置的chunkSize
        chunkSize = executionContext.getInt("chunkSize");
    }

    @Override
    public void update(ExecutionContext executionContext) throws ItemStreamException {
        // 将当前chunkSize保存到executionContext中
        executionContext.putInt("chunkSize", chunkSize);
    }

    // 其他方法省略...
}