How to create multiple paths of different colour using Google StaticMap in Google Apps Script?

I am trying to create a small app that will take x number of lists of locations (in the form of Geocodable Addresses) and displaying them on a StaticMap as x different paths.

To change the style of the paths the documentation says to use

setPathStyle(weight, color, fillColor)

When doing this though I cannot find a way to make the fill colour fully transparent, or to have no fill colour at all.

I build the map and retrieve the URL using this Google Apps Script code (The real app is connected to a Google Sheets document with changing addresses which is why I am using GAS):

function mainFn() {
  addressList = [[['London, UK'],['Milton Keynes, UK'],['Cambridge, UK']],
                [['Reading, UK'],['Oxford, UK'],['Bristol, UK']],
                [['Gloucester, UK'],['Worcester, UK'],['Birmingham, UK']]]; //would normally be sourced from a Google Sheets document

  directions = getDirections(addressList);
  map = makeMap(directions);

  Logger.log(map.getMapUrl() + '[API key]') //retrieve URL of generated static map image
}

function getDirections(addressList) {

  var directions = [];
  for (h = 0; h < addressList.length; h++) {
    var directionFinder = Maps.newDirectionFinder()
      .setMode(Maps.DirectionFinder.Mode.DRIVING)
      .setOrigin(addressList[h][0])
      .setDestination(addressList[h].slice(-1));

    for (i=1; i < addressList[h].length-1; i++) { //iterate through each address, creating a waypoint for each
      directionFinder.addWaypoint(addressList[h][i]);
    }
    directions.push(directionFinder.getDirections());
  
  }

  return directions;

}

function makeMap(directions) {

  //create map
  var map = Maps.newStaticMap()
  .setSize(600, 600);


  // Add markers
  var markerSize = Maps.StaticMap.MarkerSize.MID;
  var markerColor = Maps.StaticMap.Color.GREEN;
  var markerLetterCode = 'A'.charCodeAt();
  //create list of possible path colour ENUMS


  // Add markers to the map
  for (var i=0; i<directions.length; i++) { //iterate through each route
    var route = directions[i].routes[0];
    for (var j = 0; j < route.legs.length; j++) { //iterate through each leg of a route
      var leg = route.legs[j];
      if (j == 0) {
        // Add a marker for the start location of the first leg only.
        map.setMarkerStyle(markerSize, markerColor, String.fromCharCode(markerLetterCode));
        map.addMarker(leg.start_location.lat, leg.start_location.lng);
        markerLetterCode++;
      }

      map.setMarkerStyle(markerSize, markerColor, String.fromCharCode(markerLetterCode));
      map.addMarker(leg.end_location.lat, leg.end_location.lng);
      markerLetterCode++;
    }

      //add path
    map.addPath(directions[i].routes[0].overview_polyline.points);

  
  }

  return map;
}

This creates this map.

I like how this looks, except I would like the paths to be different colours.

If I add the following:

      var pathColours = [Maps.StaticMap.Color.BLUE, Maps.StaticMap.Color.GREEN, Maps.StaticMap.Color.RED,
                         Maps.StaticMap.Color.PURPLE, Maps.StaticMap.Color.ORANGE];

      map.setPathStyle(2,pathColours[h], pathColours[h])

before creating the map in the makeMap function, It generates a map looking like this.

Essentially it closes the loop, connecting the first and last points of each path, then fills in the area bounded by the path.

Since there seems to be no other way I can see to change the path style that allows not setting a fill colour, or setting it to transparent (beyond programmatically generating a custom URL myself), how can I create multiple paths of different colour?

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