I have moved this topic to the GDL forum because this is more of a GDL question than a Construction Documentation question.
So, to achieve this, you need to have GDL knowledge. In the 2D Script of the Label, you need to use either of the following 2 GDL commands (Page 501 of the GDL Reference Guide) :
n = REQUEST ("ASSOCLP_PARVALUE", expr, name_or_index, type, flags, dim1, dim2, p_values)
or
n = REQUEST ("ASSOCLP_PARVALUE_WITH_DESCRIPTION", expr, name_or_index, type, flags, dim1, dim2, p_values_and_descriptions)
This command can return the value of that parameter of the Door you want into the Label. Then depending on the value returned, the 2D of the Label can be or not be generated.
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