Feel free to use whatever is comfortable for you to make the game playable. It's not encouraged but you aren't restricted from doing so
I highly recommend though, in the spirit of this jam, that you submit a lo-fi version that allows those without Tabletop Simulator to recreate the experience
This is my own understanding of what is written on the jam page by the way. HeskHwis can probably chime in if I am mistaken :)