Filtering as a part of Main Menu Navigation?

Hello,

Is is possible to create a navigation item as a part of the main menu (header navigation) that directs to a pre-filtered collection of products? Instead of just a single collection?

For instance, I believe before OS 2.0, you were able to specify a tag to filter a collection as an option for a nav item. If this is still possible it would help customer experience a lot so they don’t need to jump from one collection to another to find different items. I also wouldn’t need to create a separate collection for every filter.

I hope this makes sense, please let me know.