Change the "site property" web part via PS

Occasional Visitor

I have hundreds of pages in a site page library. All of them have the "site page" web part and currently shows things like keywords, published date etc.

 

I want to add another field/property to this web part for all pages - "Category". Is it possible by script (via PS for example) to add this property to the web part instead to do it manually for each site?

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