As per your suggestion at https://github.com/oobabooga/text-generation-webui/issues/159 here's my attempt.
I'm brand new to python and github. Completely different from unreal + visual coding, so forgive my amateurish code. This essentially adds support for Eleven Labs TTS. Tested it without major issues, and I believe it's functional (hopefully).
Extra requirements: elevenlabslib https://github.com/lugia19/elevenlabslib, sounddevice0.4.6, and soundfile
Folder structure is the same as the SileroTTS Extension.