The new car warranty will cover it and you are entitled to a free loaner car while your Giulia is in the shop for warranty work.
You're right, the new car warranty should cover the repair. But there is no guarantee of a free loaner car ever. Not for routine service, not for warranty repairs, not for non-warranty related repairs (such as owner abuse, misuse, wear and tear or collision damage). Loaner car policy is determined by each dealer and availability is on a case-by-case basis. I waited 7 weeks for a loaner car to be available from one dealer and my sales dealer has no loaner cars at all for Alfa customers despite being a Maserati/Alfa dealer in one of the richest counties in the USA with a suitably high population density and sales volume.
FCA may pay for up to $30 per day in rental car coverage for an FCA vehicle from Enterprise if the dealership service manager requests pre-authorization for warranty repair (FCA might even pay for a non-FCA rental car if no FCA vehicles are available at Enterprise). But that is no guarantee, either. In fact, you will not find such policy provisions printed anywhere. From what I've seen on this forum alone there is a very high variation in customer service quality from dealers and corporate alike. Some people get Maserati Ghibli loaners the same day for oil changes. Others have strong Lemon Law cases and weren't even offered a measly rental car from Enterprise.