In 2018 FMC (Frequency Monitoring Codes) zones has been implemented in some part of the Italian airspace (of course in the most trafficated areas)
SD does take care of them, but (AFAIK, please correct me if I'm wrong) they are noticeable only in the radio menu during navigation, just indicating the squawk code and radio frequency when you're there. This means, of course, that these zone coordinates are well known to SD, but not explicitly shown in planning/navigation maps.
Being them mandatory
(with all the consequences they could have if you ignore them), I strongly believe they should be treated as any other airspace, where SD show them on the map (both planning and navigating), as well raise alerts when the aircraft is going to enter in these areas.
Here below quick maps of the FMC zones: