My March rating should be 2203, if I get it I'll "report" myself as a titled player to chess.com.
If you have a virtual rating of 2200+ (doesn't have to be published on a list), then you can pay some money to FIDE and get the CM title. Then you can show proof of the title to chess.com to get the title on here. I don't think they'll give you a title on chess.com if you didn't get the actual title, just the rating.
NM exists in a few countries, and probably has different requirements in each country where it exists.
I know that too. CM is the same in Poland and FIDE, but 2300 is different.