This is still early days so you have to expect some bugs, but it is a mostly functioning map that lets you write your story in WordPress and Visualize it in a dynamic map.
Here is a demo of its current state:
So that is the child theme that runs the map. You also need a map. Right now this map is also in a bit of a messy state, but it can be used with some geojson data:
This map shows terror attacks in France in a map that allows step by step progression through a story. You will need to make the necessary steps in the map, and then write the story describing the steps in WordPress. The result will hopefully be a more immersive map.