Kangoo 3 spare wheel possible to retrofit?

Hello. I bought a Renault Kangoo. Since I needed it quickly and took what was in the inlet at the dealer, I have now not prepared a spare wheel. Can one realize this afterwards somehow? The place is there, a trailer coupling is not installed. I have the hope that one can just screw the basket for the tire under it. If the dealer can’t/will do that. Who can you turn to? Thank you very much.