Hello, wow,,,, great question. I'm an enduser as well. I have been reading this forum for a number of years and I don't think I have heard that question. I'm thinking your best bet it to open a support ticket with the folks at Google and see what they say. Here is the link (below).
That being said and having a good deal of experience I think your library of faces is gone and you may want to just start rebuilding it.
https://support.google.com/googlenest/gethelp
