code: func (s *Scheme) AddFieldLabelConversionFunc(gvk schema.GroupVersionKind, conversionFunc FieldLabelConversionFunc) error {
  	s.fieldLabelConversionFuncs[gvk] = conversionFunc
  	return nil
  }
docs: // AddFieldLabelConversionFunc adds a conversion function to convert field selectors
  // of the given kind from the given version to internal version representation.