Fetching horizonElevation through API

Thanks for the APIs on Opensolar, they are very helpful, but we were wondering if we can recreate the sunpath diagrams. Matching the payload that is returned on the web, there seems to be a "horizonElevation" data that needs to be passed to the /api/sunpath_diagram_image to get the Sunapth images.

We were not able to find an API endpoint that would return the horizonElevation data. Can someone pls guide how to get this data?

Thanks

Raja