What is the best solution for export from kindle to paperpile?


Hi everyone I recently bought a kindle and download some pdf from this ebook website but I like to sync up my kindle and paperpile library because I like to write papers on Google Docs. So I want to export my entire Kindle library and have each reference WITH its pdf attached in Paperpile, In the Paperpile documentation they talk about doing a RIS export from Endnote and then import into Paperpile, but I can’t find a similar thing in amazon kindle. Do you think there is or there are solutions for this? Thanks for your help