Pinout diagram The T-Embed SI4732 board shares the same GitHub repository as the original T-Embed. The main page does not mention anything about the SI4732 module, but I can see a SI4735_Shield_250308 ...

Adafruit TinyUSB Library for Arduino This library is a Arduino-friendly version of TinyUSB stack. It is designed with structure and APIs that are easily integrated to an Arduino Core.