No option to export Prores (or any codec?) with mono audio

Hello world,

I must be blind or experiencing some strange glitch or something, because this seems unreal. Media Encoder and Premiere are giving me no option to export video with mono audio in the dropdown under Audio tab of Export Settings. For the smarta$$es out there 😉 I need to export mono audio because some of the footage in my project is cell phone vid where the recording was set to mono for some reason, and I'm making proxies of everything. I can't make proxies of the mono audio clips because if I don't export with mono audio, Premiere then tells me when I go to Attach Proxies that it can't attach proxies that don't have the same audio channels. It's a death spiral! Please tell me I'm just being stupid and don't tell me I have to go to an old version just to export mono...