DU Framework - Extracting information out of 3 different PDFs - need to Build 1 Queue item out of the extractions of the 3 PDF

Hey all!
I’m not sure how best to set up the process. I have 3 different PDF files or a merged PDF from the three documents. I use the DU Framwork to extract the data with the corresponding ML Skill (3 custom skills - extract master data, extract creditor, extract reason for claim table). Then I would like to save the information of all three ExtractionResults in a Queue Item.
Presumably due to the parallel nature of the ML skills, the extracted result from PDF 1 is not saved to the end. Is there possibly an efficient procedure for this?