You can see the space in the red box between the main and service road.
What should we code for sidewalk? (it does not look a formal sidewalk)
I think you can code that as a sidewalk
I would not. It looks like a median, and the pedestrian seems to wait for the possibility to cross the road, not to go along.
This is not a Sidewalk because sidewalk is built at the ‘side’ of a road not in the center.