Just grab the PGN and insert it as a diagram/puzzle that way. Then link to the original tactic if you want to reference it that way.
https://www.chess.com/forum/view/help-support/a-guide-to-posting-your-games-on-chesscom
That probably mostly references v2 but the method is similar in v3. To turn it into a puzzle you check the Puzzle option on the Theme tab.
I don't want the full games, just the tactics puzzle but I can't figure out how to insert one.
Thanks.