@Torakikiii If the PDF is in CMYK mode and has a die cut shape with a spot color for the stroke (say, one named 'diecut'), it should import correctly and show in the Print dialog or in the RIP as a separate plate.
You might need to set the die cut shape's stroke to overprint however.
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Also: if I understand correctly, when you receive a 2-page PDF (page = artboard) where the 1st page has the artwork and the 2nd one has the die cut shape, you'd like to have the option for both to be overlapped directly on import on a single artboard?