Creating a custom KML file to load approach path data that is present in a json file

Question

I am working on kml file integration on cesium maps. I already have a json file with approach_path data for airplanes. I want to convert this file into a kml file so that I can load the corresponding data onto the cesium map showing the approach paths onto the map itself. (There is a valid reason why i don't want to load the json file directly that I have. I want to load the kml file only!).

So for creating a line using kml file onto the cesium map I have to use a tag named : <LineString> along with the other tags this linestring has another subtag named : <coordinates> which requires 2 values i.e from where to start and where to end.

But in my json file the data that I have is as follows :

[
  {
    "Rwy": "30R",
    "Altitude": 82,
    "Gradient": 3,
    "Course": 299,
    "Distance": 9.2,
    "Variation": 2,
    "lat": 25.24775,
    "lng": 55.38086111111111,
    "DMS": "25°14'51.9\"N 55°22'51.1\"E"
  }
]

Now the above data represents a single line where it is just using a single coordinate (lat and lng) it is not using a start coordinate and a end coordinate to create a line like we need it in case of a linestring what I think is in the json file they are using directional data as well as i dont know what rwy course DMS and variation represent maybe it is used to create a vector which has a start point and extends in a particular direction for a certain range.

Now the real question is how can i create a vector in kml? which has only 1 start point and extends in a particular direction for a particular range.

Anykind of help will be appreciated :)