Add custom fields in Tracked Object

Is there a way to add custom fields in Tracked Object?

My use case is that I want to timed how long does a object enter a defined roi with NvAnalytics.

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
• DeepStream Version
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

maybe you can add a user meta to achieve that, refer deepstream user meta sample app