Click¬†“Map Settings” button at the top right corner of Map
A drop-down will appear with Map options.
Set “Show as¬†SVG” to ‘Yes‘
Hit the ¬†button to import geojson to Map Click to get¬†Sample D3 GeoJSON¬†File
Note: Every Marker should have a property named “id” and value should be “route” in order to make it work with D3