I post an answer but looking for other answers and will not give the check to my answer.
I live in Houston and the common protocol is bike left or bike right. Bike left is bike passing on the left. If the pedestrian does not know the protocol they will turn look to the left so things can go bad. If it looks like an experienced runner they probably know the protocol. Pedestrians don't do a good job of staying right. And if you have traffic both ways you may drop off the path and pass on the right. We get some bells but they are mainly Europeans. When I hear a bell I look for an ice cream truck.
For a couple hours a day a 1 mile loop is shut down and get some racers training. It can be a problem there. You will get kids learning to skate and all over the road. Racers can get irritated and it is not always a polite exchange.
I have a pretty loud cassette so on the sidewalk I just coast and let them hear me.
When I lived in Seattle there was more use of bells. Also many more blind turns. And pedestrians did a better job of staying to the right.
On the trails the protocol is rider up or rider back. Going into a blind turn rider up. Then when you pass you call out how many riders are behind you - e.g. 2 back or if none then clear back.
A runner will call out runner up. I guess if they passed you they would call runner back but I have never been passed by a runner.