Thanks a lot for your reply. I totally understand your problematic to select what to include in your todo list. It's very nice to take my needs into account.
I join a fake screenshot of what I have in mind. You will see the categories and products separators in dark red. It's like some other ecommerce searches, to show the results by type: products, categories, …
In my case, hooks usable in JS could solve my problem, even if it's not the best way for performances (regenerate the results ordering).
Have a nice day,