Getting collider vertices from a tile on a Tiled map

Hello all!

I plan to use Box2D in Cocos Creator and have so far managed to load a Tiled map into CC.

For building the Box2D colliders I need to extract the collider info for each tile in the map. How would I do that?

I have the map loaded and

var layers = this.tiledMap.allLayers();
var firstLayer = layers[0];
var firstTile = firstLayer.getTileAt(0, 0);

How would I get the collider vertices from “firstTile”?

Thanks!