input: from typing import Any, Dict
  
  def read_data_from_json(filename: str) -> Dict[Any, Any]:
      """
      Reads data from a JSON file and returns it as a dictionary. If the file does not exist or if the file content is not valid JSON, appropriate errors are handled and messages are printed.
      
      >>> read_data_from_json('existing_file.json')
      {'key': 'value'}
      >>> read_data_from_json('nonexistent_file.json')
      The file specified does not exist.
      >>> read_data_from_json('invalid_json_file.json')
      The file specified is not in a valid JSON format.
      """
output:     import json
      import os
  
      try:
          if not os.path.exists(filename):
              print("The file specified does not exist.")
              return {}
          
          with open(filename, 'r') as file:
              data = json.load(file)
              return data
      except json.JSONDecodeError:
          print("The file specified is not in a valid JSON format.")
          return {}