I look, and there is no cropping data on the cover ...
For KML, you can simply do this on the server side. opend, then kml, as an xml file, and scanning this dom for the label, polygon and lineaRing label inside you will find the coordinates in lng, lat format.
Client side, you can do this with jquery by loading the xml file and scanning the node you need ...
The kml line is the standard ...
<Document>
<Folder>
<name>Full Satellite Footprint - EIRP</name>
<Placemark>
<name>Atlantic Ocean EIRP 40dBW</name>
<styleUrl>https://www.telesat.com/kml/TelesatKMLStyles.kml#coverageArea</styleUrl>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>36.826,55.201,0 37.0055090185901,55.2151134621769,0 36.8423211206917,55.6055987892911,0 36.5363438121321,56.3253739818074,0 36.2041398771245,57.1121727752464,0 35.6982976142624,58.2038341375218,0 35.4781980136987,58.66035224623429,0 35.2392363744069,59.1245171274041,0 34.991585220959,59.5937508918316,0 34.7381410580738,60.0586398991811,0 34.4948230756851,60.5170059779041,0 34.2134913653683,60.9937069314964,0 33.9399744247826,61.4547783456267,0 33.6430131750038