You want something like this: https://www.amazon.com/Interface-Adapter-Charge-Accord-Odyssey/dp/B07DNF9V79/

Basically this plugs in to the unused CD changer port on the factory radio to create new input methods, so to use this audio you just put the radio on CD.

Double check that is the right part before ordering, I googled some poorly chosen words and did not verify this works in an 08. You get the idea though. There might be a better brand, dunno. Been a long time since I used something like this.