2) Posts here are not dynamic. The value will not update. So, the answer to the second part is "NO."
1) It should be possible, but I don't know Google Sheets' mechanisms for importing data.
I'm assuming it has advanced far beyond my last experience, and would naturally assume pluggable modules are allowed, such that if you dev a pluggable module for the Google Sheets platform, along whatever development lines they give, you should be able to pull data from an API. But, as they say, assumptions are the mother of all mistakes.
Lastly, using spreadsheet software for data manipulation and presentation like this is really bad form.
Another way of looking at it (answering your own question): IF you could present dynamic information like this, then wouldn't you be able to do it on Chess.com without first having import things to a spreadsheet? If dynamic behavior is allowed, then it would be highly likely that calculations could be made dynamically, too, thus negating the need for a spreadsheet.
I'm wondering if there's some way in Google Sheets to either/or:
1) Get the result of the game imported right into the sheet, from a game link. Like, can I give the sheets a link and have them look up the result of the game from the cc database, automatically?
2) Put the value of a Google sheet cell into a chess.com news post, with the edit html feature. Can I embed something so (the post) will look up the value in a sheet cell, and return it automatically?
Thanks!