Label is a subclass of Marker. It draws text at a coordinate.

You should update label's boxStyle and textSymbol, and label's symbol will be updated automatically for display.

index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Geometry - Label</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.min.js"></script>
  <body>

    <div id="map" class="container"></div>

    <script>
      var map = new maptalks.Map('map', {
        center: [-0.113049,51.498568],
        zoom: 14,
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

      var label = new maptalks.Label('label without box',
        [-0.126049, 51.496568],
        {
          'draggable' : true,
          'textSymbol': {
            'textFaceName' : 'monospace',
            'textFill' : '#34495e',
            'textHaloFill' : '#fff',
            'textHaloRadius' : 4,
            'textSize' : 18,
            'textWeight' : 'bold',
            'textVerticalAlignment' : 'top'
          }
        });

      var labelBox = new maptalks.Label('label with box',
        [-0.109049, 51.496568],
        {
          'draggable' : true,
          'boxStyle' : {
            'padding' : [12, 8],
            'verticalAlignment' : 'top',
            'horizontalAlignment' : 'left',
            'minWidth' : 200,
            'minHeight' : 30,
            'symbol' : {
              'markerType' : 'square',
              'markerFill' : 'rgb(135,196,240)',
              'markerFillOpacity' : 0.9,
              'markerLineColor' : '#34495e',
              'markerLineWidth' : 1
            }
          },
          'textSymbol': {
            'textFaceName' : 'monospace',
            'textFill' : '#34495e',
            'textHaloFill' : '#fff',
            'textHaloRadius' : 4,
            'textSize' : 18,
            'textWeight' : 'bold',
            'textVerticalAlignment' : 'top'
          }
        });

      new maptalks.VectorLayer('vector', [labelBox, label]).addTo(map);

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