docs: public Map<String, List<MiningField>> getMiningFields() {
          Map<String, List<MiningField>> miningFieldsMap = new HashMap<>();
          for (PMML4Model model : getModels()) {
              List<MiningField> miningFields = model.getRawMiningFields();
              miningFieldsMap.put(model.getModelId(), miningFields);
              model.getChildModels();
          }
          return miningFieldsMap;
      }