How to generate normals in Omniverse apps?

When I import some CAD files, such as STEP or SLDPRT, using the CAD Converter, I find that the Normals list is empty. In the ASSET Importer extension, there is an option to ‘Generate Smooth Normals’, but this option is not available in the CAD Converter. Could you please give me some advice on how to generate normals for these USD files converted from CAD files?

As the Fig we can see , the Normals list is , which is empty.