HQPlayer Embedded Discussion [2021-2022]

Hello,

I just bought a pi4 and installed the trial version of hqp embedded.
The intention is to use it as upsampler device. The chain I am aiming looks like this:

Android phone running spotify --usb cable–> pi4 w/ hqp --usb–> ddc --i2s–> dac

Can you link me to the discussion on how to achieve this?
Thank you.