How to Add kde-inhibit --screenSaver when system update

How do I add a kde-inhibit --screenSaver in the system update short cut to stop computer sleeping when I update my system

I try to edit the short cut call "system update" and I have no idea how do I edit it.
I was try to do the way like using steam like adding kde-inhibit --screenSaver %command% for steam game not stoping sleep
I hope there is a way like it.
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