How to add line-level aux input to Amazon Echo w/ TPA3110D2 Class D chip?

Hi All, this forum looks like just what I've been searching for!

I want to add a line level input to my 1st gen Amazon Echo, which uses a Texas Instruments TPA3110D2 Class D amp chip (useful teardown of the Echo is here: https://www.ifixit.com/Teardown/Amazon+Echo+Teardown/33953). I'm aware that they can be setup to run as Bluetooth speakers, but I'm specifically looking to add a hardware input here.

Does anyone have any thoughts on how this could be achieved, or examples of similar projects that have added aux inputs to a device with this kind of chip?

Thanks!
 

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