Laravel Eager loading specific columns

I have two classes, Book and Category. The relationship is defined properly.

When i use like: Book::with('category')->where(...)->first()

It returns like:

Book{
bookid:
bookname:
.
.
Category{
    categoryid:
    categoryname:
    .
    .
    }
}

Is there a possible way, to return like the format below without using join?:

Book{
bookid:
bookname:
.
.
categoryid:
categoryname:
.
.
}

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