question

Are you talking about the data stored in the entity object? If so, you can refer to Use entity objects to store player data - PlayFab | Microsoft Docs to get it through GetObjects.

What does "using player title Id" mean? Do you mean how to write the Player Title Id to the Entity Key? If so, please refer to the following format.

  "Entity": {
    "Id": Player Title Id,
    "Type": "title_player_account"
  }