I maintain a separate Authors library (one book per author), it contains custom columns for date of birth, place of birth, date of death, place of death, cause of death, links to wikipedia page, author site, publisher site, obits, etc. I maintain this manually, i.e. no downloading.
In the Author link field in my Books library, I put a calibre://show-book/ URL to the Author book in my Authors library
In the Author link field in my Authors library I put a calibre://search/ URL for the Author in my Books library.
The show-book and search URL's can be obtained via the Copy option in the Book details panel context menus.
See ==>>
The calibre:// URL scheme
BR