Did they top off the oil? I didn't see anything about that, and a good tech won't just note that in the service records, but actually do something about it. He may not have authority to do an oil change, but topping it off is another story.
Whether this was good intent on the dealership or fishing for an expensive oil change to charge for, the notes are in the Stellantis system. I wouldn't want to jeopardize my warranty by changing oil myself and using products that may or may not be approved. Unfortunately they set the table with this situation, and I feel like the best choice to avoid significant hassle when you need warranty service again, is to have the regular maintenance performed at the dealer.
Look at the risk vs reward. You may want to perform all the maintenance yourself, but is it worth the risk of having a warranty claim denied or even the hassle of the fight? And, not to criticize further, you bought a Jeep product. They are very expensive and complex and known to have issues. Again - if I was in your shoes, I'd have the dealer maintain through the warranty period. Then have at it.