Thanks for your request. The latest version of Aspose.Pdf supports converting PDF documents to DOC format. So you can use Aspose.Pdf to convert your PDFs to DOC format and then use Aspose.Words to insert the generated DOC field into another Word document.
You can check the following documentation link for details and code snippet.
I am sorry to inform you that PDF to DOC conversion is currently not available in Aspose.Pdf for Java. However, we have already logged a new feature request as PDFNEWNET-33135 in our issue tracking system. Our development team is looking into this feature and you will be updated via this forum thread once it is supported.