Item description scroll bar

Of course!
That has nothing to do with UIS though, you can do this in Unity by default
You need a ScrollView and in the content of the scroll view you want to add a ContentSizeFitter component that resizes the component to fit the text.

If you can't get it to work make sure to check for tutorials online.
If you don't only have text in your description but other things that can change it's size, you can also write some code to resize the content to fit your needs. I remember doing that in one of my games because I needed more control over the scrollbar
 
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