To see it in action:
Crust.piefed.social (the Piefed development instance)
Not all instances implement it yet, I guess it depends how often they pull from the dev branch
Example of search for 'movies'
Not that I know of, and while I hate to shill for Lemmy rather than PieFed, there is just such an interface on the instance you are already on: https://old.lemmy.zip/ . That does sound like a great idea for someone to make though...