Does it make sense to try mounting the jigsaw onto the table?
If it's a hand tool not designed to be mounted in that manner, I would advise against doing this as it has the potential to be dangerous. Think about what would happen if the tool were to become dislodged or the blade break off.  In the event of an emergency, how would you quickly shut it off? Saws like table saws and band saws should have an easily accessible shutoff button.