code: def add_target(self, target_name, values):
          
          target_data = {
              'name': target_name,
              'frames': []
          }
          for i, v in enumerate(values['SDR']):
              frame_data = {
                  'time': i * self.hop,
                  'duration': self.win,
                  'metrics': {
                      "SDR": self._q(values['SDR'][i]),
                      "SIR": self._q(values['SIR'][i]),
                      "SAR": self._q(values['SAR'][i]),
                      "ISR": self._q(values['ISR'][i])
                  }
              }
              target_data['frames'].append(frame_data)
  
          self.scores['targets'].append(target_data)
docs: add target to scores Dictionary
  
          Parameters
          ----------
          target_name : str
              name of target to be added to list of targets
          values : List(Dict)
              List of framewise data entries, see `musdb.schema.json`