FM Radio

[biketool]

It is not. However it should be possible to add a module for that via the expansion pogo pins on the back.

No, the expansion port can't pass audio.

Correct, but it can do I2C, and I2C FM radio modules are pretty common.

I2C is for settings and RDS data. Audio has separate wires (left and right).

Think of i2c pogo pins to an i2c FM radio chip/board the same as a serial cable on a 30 year old computer to an external voice modem, or even a poor person stuck with an Apple phone who uses an apple digital USB lightning port to audio-headphone dongle and it makes sense, you can push two(or many more) channels(stereo) of digital audio in the i2c stream along with control and other data and the phone pushes it to the OS and then out the DAC which is the phone's sound chip and then analog out to speakers or the headphone port.