PlatformIO already generates .bin files as part of the compile process… if you browse to the .pioenvs / .pio/build / name-of-env folder of your project, you’ll find firmware.bin.
Alternately, it’s mentioned as one of the last few lines of the build process, and you should get a message about being able to Ctrl + Click on the path to navigate to it… which will at least find the file for you in the sidebar.
