CUPS PPD - default InputSlot for specific paper formats

I have a printer with multiple input slots. One slot contains A4 papers and one A3 papers. When printing A3, I need to manually select the desired input slot by supplying the InputSlot=Tray2 option. Is there a way to configure the slots in the printer's PPD (or anywhere else) so I don't have to tell the printer which slot to use every time I want to print? For example: When printing A4, use Tray1, When printing A3, use Tray2, etc...