How to make a fan switch in a shower cabin if 12V comes?

Hello. Put a shower with a Turkish bath. One of the functions of the cabin is ventilation, but very weak 12V, I had to do my own on 220V. In order not to build in a separate switch, I would like to connect to the one in the shower. That is, is there a switch that, when a 12V load appears, would act like a button on a conventional switch, connecting in my case 220V? Google crawled, wrote differently requests - did not find anything similar. Thank.