Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Export to USD Layer
USDEXPORTER_EXPORT2LAYERParameter: File Format
USDEXPORTER_FILEFORMATParameter: Zipped (*.usdz)
USDEXPORTER_ZIPParameter: Cameras
USDEXPORTER_CAMERASParameter: Lights
USDEXPORTER_LIGHTUNITSParameter: Geometry
USDEXPORTER_GEOMETRYParameter: Normals
USDEXPORTER_NORMALSParameter: UV
USDEXPORTER_UVParameter: Vertex Color
USDEXPORTER_VERTEXCOLORSParameter: Display Color
USDEXPORTER_DISPLAYCOLORParameter: Materials
USDEXPORTER_MATERIALSParameter: Bake Materials
USDEXPORTER_MATERIALS_BAKETEXTURESParameter: Width
USDEXPORTER_MATERIALS_WIDTHParameter: Height
USDEXPORTER_MATERIALS_HEIGHTParameter: Resize Textures
USDEXPORTER_MATERIALS_RESIZEParameter: Format
USDEXPORTER_MATERIALS_FORMATParameter: Format
USDEXPORTER_MATERIALS_FORMAT_USDZParameter: Depth
USDEXPORTER_MATERIALS_DEPTHParameter: Animation Range
USDEXPORTER_ANIMATION_FRAMESParameter: From
USDEXPORTER_ANIMATION_TIMEFROMParameter: To
USDEXPORTER_ANIMATION_TIMETOParameter: USD_EXPORTER_MATERIALS_BRIDGE_INFO
USD_EXPORTER_MATERIALS_BRIDGE_INFO