Need Help Identifying Line-In on PCB

Hi everyone, I have a samsung wireless sub that I'm trying to re-purpose and add a 3.5mm jack to. The problem I'm running into is that the wireless chip seems to only have options for digital in for something like usb. The wireless chip on the sub is the WSM520V. I've included photos of the board the chip connects to and if anyone has any suggestions on where I could insert a analog line in connection I would really appreciate them.

Thanks!

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