Read metadata variables of the parent form in the child form

Hello! I have a parent form and a child form, I can bring variables from the parent form to the child without problems. But I would like to bring variables from the metadata of the parent form, such as the one shown in the _id column, but I am not achieving it.
It is possible?
Thanks!
Pablo

@pschweitzer, kindly please be informed that the system still does not support linking system variables through the dynamic data attachments at the moment.

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