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Adding Custom Attributes to the componnent of a guide (or hostUI) and keep that attribute in built rig

Hi! I’m still inexperienced with mGear, only started using it in production a month or so ago. I have a question regarding custom attributes.
Is there a way (not using post_scripts) to add an attribute to a guide element, and keep that attribute in the built rig?

For example (just to illustrate):
I have a rig that has a common body, and then it has some elements that correspond to the 3 characters that share the same body, I wanted to create an ENUM attr with the names of the 3 characters inside the specific component in a guide, and then, when i build the rig, that attribute doesnt dissapear.

I know that this example is simple, but its just to illustrate the base of what I want.