Source and connect 2x piezoelectric mics/preamps to T3RS-plug compatible with Sony Xperia2+ devices

I want to connect 2 piezoelectric mics which are stuck to an adult's chest to listen to breath sounds to each of the mic level inputs of a sony phone/tablet which supports the dual mic input T3RS-plug. Project involves sourcing appropriate piezoelectric microphones, connecting them to an appropriate preamp (if required - i'm not sure) and then wiring these to the dual mic inputs of a T3RS audio plug so that the audio can be accessed via a device such as a Sony Xperia2 phone or tablet.