system
A chat on subreddit /r/wallstreetbets
human
Asda in the UK (who are owned by Walmart) already use this, it's pretty seamless and quite a lot of people use it from what I can see . 
  
 I prefer it as I can pack as I go

gpt
I very well know a few grocery stores have that option in Europe, but from my own experience I rarely see people use it.