Low-power am radio transmitter for esp-32 or RPi Pico?

Does anyone know of a breakout board I can use with a small microcontroller (or even a small microprocessor like a Pi Zero) that will allow me to broadcast low-power AM radio shows to an antique radio in the same room?

I see a lot of frankenprojects with circuit diagrams that you can solder up yourself. What I’m looking for, however, is a breakout board I can simply purchase and then attach to my micro-device of choice.

Any ideas?

Thanks in advance,