It needs to have multiple drives. D, 1, 2.

Pretty much all automatic cars have a "gear" or setting for engine breaking. Even my Prius with a CVT has it: a separate button for Park, then you "shift" to put the car in Drive, Neutral, Reverse, or B for engine Braking. I don't think I've ever needed to use it, but it's there.

Automatics that don't have a CVT may not have a dedicated Engine Braking setting but they should have a forced 1st, 2nd, and/or 3rd gear (or Low and High which is 2nd or 3rd). The computer is locked so that it won't shift higher, which you can use to engine brake.

Finally, there are the "semiautomatic" cars or automatic with a semi setting, where you can "shift" like you're in a manual but the computer and automatic transmission does the actual physical shifting of the gears; they just do the shifting when you say to rather than when the computer wants to.

Something people haven't mentioned is you can also take advantage of cruise control to make your automatic downshift. Turn it on and then use the buttons to decrease the set speed and the car will downshift to help slow down. But this isn't something you'd do to normally come to a stop, more just on long descents to use some engine breaking.

I engine brake all the time with my automatic. My honda accord has slappy flaps (paddle shifters). Turns out my transmission is considered an "automated manual" meaning that it's basically a manual but with electro-hydraulically controlled clutches on each gear, controlled by a computer (unless put in sport mode).