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PdfWriter writer = new PdfWriter(baos);
    PdfDocument pdf = new PdfDocument(writer)
    PageSize pagesize = PageSize.A4;
    Document document = new Document(pdf, pagesize);
    document.setMargins(75, 75, 65, 70);

Agregar un text despues en un paragraph despues en un document text

     document.add(paragraphJustified().add(formatText(reporteContratoContenidoService.parrafoUno(), "P1")));