You can do notebook lm now in free and open source. This calls apis, but running it locally without cloud is very feasible. https://github.com/gabrielchua/open-notebooklm

https://fountain.fm/episode/Thk97UqdpIL6BJLNPmFo

nostr:nevent1qvzqqqpxquqzqxdx57ud5xk72ecg52eckr002dduegn26nqjzvm3tfe9gltpd3ff0chve3