How do I use box86?

Some months ago, i saw in the 4.3 changelog a line that got my attention:
New Packages: Box64, Box86, GL4es, Axe11, libglu (for future use)

(You can see it here: Release v4.3 · EmuELEC/EmuELEC · GitHub You need to scroll a bit)

So, I asked the EmuELEC subreddit, without any avail (I only received one comment without any punctuation and I couldn’t make any heads nor tails from it)

I’ve not found any tutorial nor anything related, so I’m beginning to wonder if it’s a hidden feature or something.