Using Apache POI replace an XWPFParagraph with another XWPFParagraph at the same position in the document

Question

I am using Apache POI to edit Docx documents. What I am trying to achieve is to rearrange an XWPFParagraph's runs by adding new runs to the XWPFParagraph, but inserting new runs to a paragaph is actually adding runs to the end of the paragraph. I want to add a run to a paragraph at a specified location. Is there any way to add a new run in a paragraph at a specified location? Any help would be highly appreciated.