I erased the super long question about the nature of this jam to just get to the point.

Can I make a JRPG video game where the combat is similar to Slay the Spire (deckbuilder)? If so, can I add quick time events?(What I mean is like dodging an attack based on a player's reflexes or sense of timing)

This is a “traditional” pen and paper game jam so if you figured out how to do that via pencil and paper go forth!

Wired flex but ok. Maybe this will inspire you and other people (also I'm not sure if its really pencil and paper) - QTE where you draw spells - player decides to cast spell and in some amount of time needs to draw lets say magic circle - the closer to pattern the more powerful spell.