code: def register_filters(self):
          
          for _filter, instance in self._filters:
              if not instance:
                  self.app.jinja_env.filters[
                      _filter.replace("f_", "")
                  ] = getattr(flask_nemo.filters, _filter)
              else:
                  self.app.jinja_env.filters[
                      _filter.replace("f_", "")
                  ] = getattr(instance, _filter.replace("_{}".format(instance.name), ""))
docs: Register filters for Jinja to use
  
         .. note::  Extends the dictionary filters of jinja_env using self._filters list