How to Implement Drag-and-Drop Marker on Image in ThingWorx Mashup Runtime

We’re working on a work instruction mashup in ThingWorx where the user needs to drag and drop a marker onto an image to indicate the specific location where an operator should perform a task.

Is there a recommended way to implement this functionality within the ThingWorx Mashup runtime?
Are there any widgets, extensions, or best practices that support drag-and-drop interaction over images?

Any guidance or examples would be greatly appreciated!