Add ability to negate selected filters for a board

Problem to solve

Is there a way to add a board filter as a negation of the selected filter?

Further details

I'd like to create a board that allows me to exclude certain items via negated filter options

Proposal

Add a way to negate any desired selected filter

What does success look like, and how can we measure that?

I can create a board that shows all excpt a given milestone, user, label, etc.

Links / references