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I have the same issue. Started noticing it last month. Didn’t do anything until last week only because my motor mount was linking. They thought that was the issue but I still notice it shaking. I did find this site.
www.700r4transmissionhq.com
Might have the dealer look into it and see if they agree with anything on here.

Jeep Grand Cherokee Shakes When Idle: Causes and How to Fix | Drivetrain Resource
It can be very jarring when your Jeep Grand Cherokee shakes when idle. If your Grand Cherokee has this problem, many issues can cause it. We've lined out some of the most common causes below. The most common reasons a vehicle shakes when idling is a misfire or bad motor mount. Table of Contents...

Might have the dealer look into it and see if they agree with anything on here.