Auto Generate Mode

Can have button or check box to run in autogenerate mode.
Scan the entire site, or manually run from a page (in editor, or admin view of site).
1) Extract from other meta data (like Yoast generated metadata).
2) Extract from content based on work frequencies
3) Extract word from content, based on a list of priority keywords to look for (or tags).
4) Over ride mode to manually enter data on a page that had been set for autogeneration