An approach that I prefer, even if more technical, is to use tools such as Code2Prompt or files-to-prompt to convert entire folders (or even the entire vault) to a text file that I can then upload to NotebookLM or directly used with any LLM.

Useful links:

https://notes.dsebastien.net/30+Areas/33+Permanent+notes/33.02+Content/Code2Prompt

https://notes.dsebastien.net/30+Areas/33+Permanent+notes/33.02+Content/files-to-prompt

Example: https://gist.github.com/dsebastien/70cacc30dc0399e885022e106298c508