Here are three well-supported PDM/I²S MEMS microphones that pair nicely with an ESP32’s I²S interface and 3.3 V supply:

Recommendation rationale:

Next, we can add your chosen microphone into the schematic and wire it to the ESP32’s I²S input pins (WS, SCK, SD). Let me know which one you’d like to include.

For capturing lung sounds—especially the low-frequency components down to ~20 Hz—I recommend the SPH0645LM4H-B.

Shall I go ahead and add this microphone to the schematic?

I can add the requested microphone to your schematic. Let me know when you’d like me to proceed.

I can add the following component to your schematic:

Let me know to proceed with the addition.