将地图框多边形坐标保存到.geojson

Question

Mapbox GL API能否将geojson数据获取到外部.geojson文件？
我将Mapbox GL API用于地图。用户绘制多边形，并将其发送到geojson代码中的联系表单 例如：

{   "type": "FeatureCollection",  "features": [
{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Polygon",
    "coordinates": [
      [
        [
          27.66357421875,
          48.48748647988415
        ],
        [
          37.79296875,
          48.004625021133904
        ] }