docs: private ProcessExtensionModel convertJsonVariables(ProcessExtensionModel processExtensionModel){
          if( processExtensionModel!=null && processExtensionModel.getExtensions()!=null
                  && processExtensionModel.getExtensions().getProperties()!=null ){
  
              for(VariableDefinition variableDefinition:processExtensionModel.getExtensions().getProperties().values()){
                  if(!variableTypeMap.keySet().contains(variableDefinition.getType())||variableDefinition.getType().equals("json")){
                      variableDefinition.setValue(objectMapper.convertValue(variableDefinition.getValue(), JsonNode.class));
                  }
              }
          }
          return processExtensionModel;
      }