In Sonic Frontiers, you can collect various recordings through the Big Fishing mini-game, called Egg Memos. These contain additional flavour dialogue from Dr Eggman as he tries to escape his Cyberspace prison. There's a whole lot of canonical commentary here, and is a real audio treat for long-time Sonic fans.
Please be aware; this video contains spoilers for Sonic Frontiers.
Sonic Wiki Database: Related Entries