Yes, there is an option for automatic passing! It is just a bit hidden under a separate menu
Within a game, click the hamburger menu (3 lines), and you will see options under 'Preferences,' including discarding your last cards if applicable. Hope this helps!
Additionally, as Bender said, both auto pass and auto play do not reveal extra information you cannot get from the game log. For example, for auto pass, say you need to beat their hand with a pair, and you have 2 cards left consisting of 2 different colors with different numbers. If they were drawn from the other player, you will pass automatically. If 1 or none of those cards were drawn from the other player, you will not pass automatically. However, if you turn on auto play, you will always discard your last cards automatically if you can --- regardless of what is in the game log --- since the round is over at that point.
Hope this helps!