code: def add_annotation(self, entity, annotation, value):
          ''' Adds an annotation proprty to existing entity '''
          url = self.base_path + 'term/add-annotation'
          data = {'tid': entity['id'],
                  'annotation_tid': annotation['id'],
                  'value': value,
                  'term_version': entity['version'],
                  'annotation_term_version': annotation['version']}
          return self.post(url, dataf add_annotation(self, entity, annotation, value):
          ''' Adds an annotation proprty to existing entity '''
          url = self.base_path + 'term/add-annotation'
          data = {'tid': entity['id'],
                  'annotation_tid': annotation['id'],
                  'value': value,
                  'term_version': entity['version'],
                  'annotation_term_version': annotation['version']}
          return self.post(url, data)
docs: Adds an annotation proprty to existing entity