UxmlTraits - Detect no value set

I know that, if I create a custom component, I can specify default values for attributes.

Is there also a way to determine when no value has been explicitly set in the UXML markup?

This method will return true only if a value is set (each type of attribute has this method):
https://docs.unity3d.com/ScriptReference/UIElements.UxmlBoolAttributeDescription.TryGetValueFromBag.html

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