Help with 'advanced' mapping - features like ComputeHeading - ComputeDistance from Geometry lib

I'm developing an app for the golf industry that has at it's core video and mapping capabilities. I've found (or so I believe) that some advanced mapping functions are not available out of the box --- (Example: computeDistanceBetween(from:LatLng, to:LatLng, radius?:number) from the geometry library --- that's not the only one - it's the tip of the iceberg of functions like it that I need from that and other libraries ) - how do I include these libraries in my app?
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