No, there's no All-in Cash Out supported at the New Jersey licensed PokerStars room. This feature has appeared at other sites under the PokerStars brand, like the global .com room. The fact that it changes the way pots are paid out means that adding this feature probably requires state regulatory approval, which may be why PokerStars has decided not to roll this feature out in New Jersey or its other ring-fenced markets.
You're not missing much anyway. The All-in Cash Out option costs 1% of the value of the hand, and it makes poker less fun by reducing variance and slowing down the game. Moreover, it lets recreational players know approximately what the odds of their hands winning are. As a savvy card player, you probably already know this information, more or less, but PokerStars displaying it right on the tables educates the fish and narrows your skill edge over them.