Advice to add a custom Aux Input to Factory AM/FM AveoSVM Radio

[ontarian_frog]

I'm far from being an audio expert, but I'm not sure it's even possible to simply add an aux input into a basic AM/FM radio. I have a feeling using a wireless FM channel is the only option.

I have seen it being done. But it's nearly impossible without a lot of electronics knowledge (amplifiers mainly) and the radio schematics.