Just add one yourself? I mean it even has a speaker cable. That said an esp32 isn't that good for audio just from a practical standpoint.
What are the problems with it for audio? The microphones and speaker on this and the T-Embed [1] suggest it's partly intended for that.
I mean you can absolutely build a shoutcast stream receiver with it. Or run a NES emulator with sound on it. But this ttgo device seem like it would be best as a console or maybe a mastodon front-end. In that case the most the speaker would make sense for would be some beeps.