If you would like to store more parameters for dialog than provided in the QuickBlox dialog model, you can create a dialog with custom parameters.
Please check how to create a dialog with custom parameters using different SDKs here:
iOS SDK - Dialogs | Chat | iOS SDK | QuickBlox
Android SDK - Dialogs | Chat | Android SDK | QuickBlox
Server API SDK - Dialogs | Chat | Server API
Feel free to check our official documentation for more information that will help you to integrate QuickBlox services into your applications / projects or contact our Support team by submitting a ticket if you have any other questions.