new_contents: import json
  import ee
  from ee_plugin import Map
  from ee_plugin.contrib import palettes
  
  dem = ee.Image('JAXA/ALOS/AW3D30/V2_2').select('AVE_DSM')
  Map.addLayer(dem, { 'min': 0, 'max': 3000 }, 'DEM', True)
  
  # MANUAL STEP: use "Create layer from extent" tool and activate the resulting layer
  
  # get first feature geometry from active layer
  layer = iface.activeLayer()
  feature = next(layer.getFeatures())
  geom = feature.geometry()
  
  geom_json = json.loads(geom.asJson())
  
  # show geometry (double-check)
  geom_ee = ee.Geometry.Polygon(geom_json['coordinates'], 'EPSG:3857', False)
  Map.addLayer(geom_ee, {}, 'geom')
  
  # download dem using given geometry as region
  url = dem.getDownloadURL({
      'name': 'dem',
      'scale': 30,
      'region': json.dumps(geom_ee.getInfo())
  })
  
  print(url)
  
subject: add demo script for raster download