Sending location data to Google My Maps for custom map creation/update

I recently managed to create a manual workflow which takes multiple locations and then generates an KML file. Then import it into Google My Maps. This creates a map with custom tag visualization which I use to then build manually directions and routes like the one below:

As far as I read Google My Maps has no public API. Google Maps API is used by many packs and I tested them all but none of them achieves even anything close to routing or multiple colored pin locations.

I am not a developer and far from being experienced with Coda Packs. So, I call for help from the more experienced users to help me answer: Is there a way to achieve the same result but without manual KML creation and import?

Massive thanks in advance :pray: