Spring Batch combine FlatFileItemReader with database reading

Question

My current Spring Boot application runs a scheduler job with Spring Batch configuration where I have a FlatFileItemReader for reading the CSV rows, and a simple ItemWriter.

FlatFileItemReader<MyCsvRowDto>
ItemWriter<MyCsvRowDto>

Based on the chunk setup the CSV rows are red 1-by-1, and the writer gets all the data in a list.

I need to extend this logic to be able to read the rows from CSV and additionally a few things from repositories.

ItemReader<MyData>
ItemWriter<MyData>

where MyData contains the rows from CSV and additional things from repositories:

public class MyData {
  private MyDatabaseData dbData;
  private List<MyCsvRowData> csvData;
}

I am wondering if it is possible to do it still with FlatFileItemReader somehow, or I need to write a custom ItemReader where I read the data from repositories and then separately the CSV rows with supercsv?