I have done this flight (SCL-GIG) earlier this year in January and the A320 deployed by LATAM Brasil (JJ - LA does not cover this route with their own metal) actually had a 2-2 configuration in the separate front part of the cabin (not sure about how many rows, but it must have been three or maximum four) with typical old-style North American F Class seats, quite wide and comfy with a moveable foot rest.
I am really not a fan of JJ, but I recall this flight having been a somewhat more pleasant experience, because we were indeed positively surprised by the better seating arrangement. Of course, lounge access was included and you get improved meal service.
Not sure, if the aircraft and/or configuration has changed in the meantime, but I clearly remember that the flight was marketed and bought as Premium Economy on the LATAM (Chile) site and that any GIG-bound (direct) flight from SCL offers the option of Premium Business.