Plugins: Variable for the text of another doc (based on the outline)

Something like … {{ document_text_-1 }} would pass the text of the previous document linked in the outline, while {{ document_text_+2 }} would pass the text of the document two after the current document.

For me the main use would be to pass the full text of the last two chapters, which I find helps with getting better output from the AI, both in terms of matching my style and also the AI fully understanding what has just happened in my story.