I'm scoping this out, and was able to install espeak-ng on Mac using Homebrew... but I'm not understanding how to get quality voices loaded up (the default voic

I'm scoping this out, and was able to install espeak-ng on Mac using Homebrew... but I'm not understanding how to get quality voices loaded up (the default voice it installed is quite robotic sounding). What's the path to, for example - a high quality British voice...?