[Python] What is the syntax for adding non-rendered data/metadata to a .ui file?

I’m making an application where I’m converting a .xml to a .ui file (qtdesigner), and rendering that using pyqt.

However, there is some data in the .xml that I do not want to render (e.g. as metadata); and I need these data/variables/properties, to help parse the correct data using python on the pyqt side. How do I do this?

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