Adding a marker to Mode geographic Visualization

I was playing around with the heat map - https://mode.com/example-gallery/heat-map/ and was attempting to put a marker in the map to represent specific locations (lat long) and cant figure out how to edit.

 

I attempted to follow the leaflet instructions https://leafletjs.com/examples/quick-start/ but it appears that it does not work with mode. Anyone have any luck editing these maps?

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