Embra looks promising. We are building a similar tool based on GPT technology but only for documents searching and Q&A on documents. https://askcorpora.com
One feedback i have for you is why not build something like Google Desktop Search? It was a tool where it indexes everything on your pc and then you can search for files or something from your PC. What you can build is a Google+ChatGPT like search tool for your PC. Your tool will see and index every files, emails, websites of a user. And your tool can work as personal assistant.