The whole panel or only the set of selected Pmg objects can be exported in the main menu "Active Pmg object / Export object".
If the export option is selected then the "Data export to the XML text file" configuration window opens that can be used for entering additional export parameters.
Open the desired XML file in the application that supports this technology (Wordpad, this PROMOTIC documentation, etc.), decrease it so as not to overlap the whole screen area, mark text that has to be imported (it is mostly all text in the file), catch it by the mouse and drag it to the graphics editor area and drop it either on the empty area or over the object depending on whether you want to import the XML into the panel or into the Pmg object.
Open the Windows folder containing XML files, mark one or more XML files and drag them to the graphics editor area.