How to View RTSTRUCT DICOM file

Hi All,
Apologies for this basic question.
I am new to 3D Slicer. I am interested to perform radiomics on RTSTRUCT file downloaded from TCIA database.

How can I view a RTSTRUCT DICOM file in 3D Slicer.

I have downloaded SlicerRT but nothing was showing when I tried to import the RTSTRUCT DICOM file.

Many thanks