I haven't done (needed to) anything to the JK yet.
I did drive a Stratus as a daily driver and my wife had a Durango before her Caravan. All of them called for ATF+4.
I checked around and Mopar has an approval list. I was surprised to find the Supertech (walmart brand) ATF+4 was listed. I used it on the stratus and had zero issues. Also used it on the Durango, again, zero issues. For 4.72/quart, I'll keep using it.
Oh, the stratus was on the original transmission with 174k miles on it when we finally sold it.
2017 JKU Sport S