Linea de declaración GeoJSON

<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Documento HTML</title>
<script src="https://cdn.jsdelivr.net/npm/ol@v9.1.0/dist/ol.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v9.1.0/ol.css"/>
<style>
  html,
  body {
      margin: 0;
      padding: 0;
      height: 100%;
  }
  .map {
    width: 100%;
    height: 100%;
  }
</style>
</head>
<body>
<div id="map" class="map"></div>
<script> 
var osm = new ol.layer.Tile({
  source: new ol.source.OSM()
});

var lineaDeclaracion_geojson = new ol.layer.VectorTile({
  minZoom: 12,
  source: new ol.source.VectorTile({
    minZoom: 15,
    maxZoom: 15,
    format: new ol.format.GeoJSON({
      dataProjection: 'EPSG:3857'
    }),
    url: "https://sigpac-hubcloud.es/mvt/linea_declaracion@3857@geojson/{z}/{x}/{y}.geojson"
  })
});

var map = new ol.Map({
    layers: [osm, lineaDeclaracion_geojson],
    target: 'map',
    view: new ol.View({
      center: [-544618, 4868342],
      zoom: 15
    })
  });

</script>
</body>
</html>