Specific category for search field

Hi!

I would like to find a way to specify a certain category for the search field. The only solution I can find is to include ‘Category’ as a drop down option, but I prefer for this to be configured in the backend so no one has to make that selection before searching for keywords since this feature is only going to be for a specific set of blogs with its own category.

Is this possible in the free or pro version?

Thanks!