Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: File Format
USDEXPORTER_FILEFORMATParameter: Zipped (*.usdz)
USDEXPORTER_ZIPParameter: Cameras
USDEXPORTER_CAMERASParameter: Lights
USDEXPORTER_LIGHTSParameter: Geometry
USDEXPORTER_GEOMETRYParameter: Normals
USDEXPORTER_NORMALSParameter: UV
USDEXPORTER_UVParameter: Display Color
USDEXPORTER_DISPLAYCOLORParameter: Vertex Color
USDEXPORTER_VERTEXCOLORS