Can't get article properties from web page

Hello, When I add the following in script.js in the template, user properties are returned:

 var userRole = HelpCenter.user.role;
 console.log(userRole)

and this works:

 var isAdmin = HelpCenter.user.is_admin;
 console.log(isAdmin)
 

But I can't get article properties to return. For example, drawing from this documentation, the following code returns “TypeError: Cannot read properties of undefined (reading 'id')” :

 var articleId = HelpCenter.article.id;
 console.log(articleId)

and the following code, drawing from this documentation, returns “TypeError: Cannot read properties of undefined (reading 'name')”:

 var categoryName = HelpCenter.category.name;
 console.log(categoryName)

I use the first two code snippets to send the user role and admin status to custom definitions in Google Analytics 4.

I would like to send the page category to Google Analytics as well.

If there is a better way to send article properties like the page category to Google Analytics, I would be grateful to know.

Thank you for any time.