I upgraded my S23 to 6.1 tonight and got that voice focus feature, which is something I have needed desperately since I migrated from the iPhone. 

But surprisingly, this is working only with the phone's microphone. I don't see any value here. People who need this feature are most likely the ones who use earphones/earbuds all the time. 

Do you plan to support external headphones (Bluetooth or wired)?

Thanks