Asking this question in Actor's "issues" tab would be best.
I see You already did so. So let's just wait for response from the original dev, if there is a way to do it directly in the scraper / do they have in plans to add this feature.
For now I can recomment to post-process you result from the scraper e.q. with this utility actor:
https://apify.com/lukaskrivka/dedup-datasets
e.q. You can loop over final dataset and save only needed items.
But still it means You will spend some resources on scraping items / categories you don't need. So it's an option, but not the best (and might be acceptable if usage of E-commerce actor is cheap for you/you have enough budget).