Set filters per folder

I’d like the ability to select which feeds a filter applies to when it’s created, preferably by folder. As an example: I have all my news feeds in a “News” folder. I run across a story on 3D printing, and I create a title filter liking that phrase. It seems reasonable to assume that if I want news on 3D printing from Ars Technica, I’d also want if from Wired, or even The New Yorker, so it would make sense to be able to turn it on for that entire folder. As it stands, I’d need to do it manually in all of my ~40 news feeds, which is not impossible, just prohibitively awkward.

New user here, sorry if this has been addressed before. I really love Newsblur!