Thank you for all of your feedback everyone! My husband has to travel there for work, and I just found out about it yesterday (otherwise I would have planned way in advance). I was thinking of going with him, but it sounds like I probably should not, unless I get the Johnson & Johnson vaccine (I prefer to get Pfizer, but I will need to do more research on J&J). I was holding off on the vaccine for a time due to having a family history of blood clots, and because we still have the antibodies from having Covid.
I noticed that for the Green Pass they only need the first dose for Italian residents (or covid tests every 48 hours), but it sounds like if you are coming from the US, the equivalency of the "pass" is only the for the fully vaccinated.
I appreciate all of your helpful responses!