code: def _get_default_parameter_values(sam_template):
          
  
          default_values = {}
  
          parameter_definition = sam_template.get("Parameters", None)
          if not parameter_definition or not isinstance(parameter_definition, dict):
              LOG.debug("No Parameters detected in the template")
              return default_values
  
          for param_name, value in parameter_definition.items():
              if isinstance(value, dict) and "Default" in value:
                  default_values[param_name] = value["Default"]
  
          LOG.debug("Collected default values for parameters: %s", default_values)
          return default_values
docs: Method to read default values for template parameters and return it
          Example:
          If the template contains the following parameters defined
          Parameters:
              Param1:
                  Type: String
                  Default: default_value1
              Param2:
                  Type: String
                  Default: default_value2
  
          then, this method will grab default value for Param1 and return the following result:
          {
              Param1: "default_value1",
              Param2: "default_value2"
          }
          :param dict sam_template: SAM template
          :return dict: Default values for parameters