如何使用mapbox gl从现有图层获取geojson边界数组？

<script src='https://api.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.js'></script>
<link href='https://api.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.css' rel='stylesheet' />

mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
var map = new mapboxgl.Map({
  container: 'map',
  style: 'mapbox://styles/mapbox/streets-v11',
  center: [lng, lat],
  zoom: zoomLevel
});

map.on('load', function() {
  map.addLayer({
    id: 'your-layer-id',
    type: 'fill',
    source: {
      type: 'geojson',
      data: 'your-geojson-url'
    },
    paint: {
      'fill-color': '#088',
      'fill-opacity': 0.8
    }
  });
});

var features = map.queryRenderedFeatures({ layers: ['your-layer-id'] });
var boundaries = features.map(function(feature) {
  return feature.geometry.coordinates;
});
console.log(boundaries);