@ferhound is it hard to understand that you're asking about something that's completely not related to the topic at hand, which dates back from 2017, and try people are trying to help you based on what you initially stated ("when is this available") where you clearly didn't understand what the topic was about, and yet still expect people to have an answer for something that doesn't exist in RetroPie?
Tone was not exactly deliberate, but really: @mitu is trying to help and so was I. If you don't do your homework or participate in a clearer manner, it's hard to help you better.
You resurrected this topic, the answer you got relates to it. Don't expect that RetroPie users necessarily know what new features other projects have, so you will have to explain in more detail on occasion if you'd want to be effective at interacting here over non-RetroPie-specific topics. Not because we have anything against other projects, it's really that not a lot of people actually actively follow other very similar projects.
Long story short: that feature as you described isn't available on RetroPie. If you do have documentation or links about it, though, and would want to share, I'm certainly curious about how they do it. It does look nice from your description.
Best.