Chess.com doesn't have atomic analysis (yet) because it requires using a specialized version of stockfish that was coded by some lichess devs. You can learn more about multi-variant stockfish or download it here:
https://github.com/ddugovic/Stockfish
Integrating it would take quite a lot of work. You can see your games if you look under the "archive" tab though, and you can import them into lichess and request analysis if you want, although it is more work than it would be if atomic analysis was a feature here.
Chess.com ratings for variants are also higher than they are on lichess. There was a discussion about lowering everyone's variant ratings by 300 points to try to make them line up better, but IDK if that will get implemented or not.
Why atomic games are not listed in a profile games?
Why I cannot analyze atomic games to see what was the best move to become better player. like in lichess for example
btw. why I'm 1800 on chess.com but I can't get higher than 1500 on lichess.?