[jitter] And what about "audio" FFT in Jitter?

Following the thread "what's the equivalent to FFT in Jitter", here is
another question:
Consider a sound in a stereo [jit.buffer~].
You want to convert it to a float32 2-plane matrix with the result of an
"audio" FFT (so called "cartesian" coordinates for instance).
How would you do? Would [jit.fft] be of any use?
Jean-François.