Consider making a FeatureCollection of your ArcGIS map. Load load the FeatureCollection to your Project using the MIT Map component.
A tutorial showing one way to make a map overlay is in two parts
- How to make a Map Overlay-Part I
- How to make a Custom Map Overlay Part II .. Show the user on the Map and a Custom Map Overlay
This is a 'work around' that might work for your Project that will work with the LocationSenser or without.
Evidently it might be possible to export your ArcGIS map directly as a FeatureCollection