code: def compare_variants_label_plot(data):
      
      keys = OrderedDict()
  
      keys['total_called_variants_known'] = {'name': 'Known Variants'}
      keys['total_called_variants_novel'] = {'name': 'Novel Variants'}
  
      pconfig = {
          'id': 'picard_variantCallingMetrics_variant_label',
          'title': 'Picard: Variants Called',
          'ylab': 'Counts of Variants',
       }
  
      return bargraph.plot(data, cats=keys, pconfig=pconfig)
docs: Return HTML for the Compare variants plot