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The headlight bulb in the WK2 Jeep Grand Cherokee is a DS3 bulb which is exceptionally expensive for a head light bulb. It is also a right nightmare to replace.
Many owners and workshops claim that it is simply easiest to remove the headlight from he vehicle in order to replace the bulb. This is an option but does also require the complete removeal of the front bumper bar to do so.
It can be done in the vehicle but it can be challenging to do so. Many owners are not aware of the locking tab that needs to be spun before just pulling on the back of the bulb.
Here is a video of the headlight out of the vehicle. This shows you exactly what you need to do in order to replace that bulb.