I think the radio emissions from the nearby host star would drown out any signal from the planet.
To use our Sun and Jupiter as an example, at 10 millimeter wavelength, the flux density of the Sun for a collector on Earth is about 10^7 janskys. The flux of Jupiter at 1 AU would be about 100 janskys. This means Jupiter's RF signature power at 10 millimeter wavelength is about 5 orders of magnitude less than the Sun's at about the same distance.
A similar effect is observed when we lose communications satellite downlink signal during solar transits. The Sun is such a powerful radio emission source that it causes electromagnetic interference, making it impossible to resolve the satellite signal.
I wondered if we could point a radio antenna at a planet without also being exposed to the RF energy of the nearby host star, so I looked up ALMA's antenna pattern. "The FWHM of the ALMA primary beam is 19" at 300 GHz for a 12-m antenna" according to ALMA's website. So even if a radio telescope was pointed at the planet, and the corresponding star was an enormous 19 arcseconds away, the interfering signal power from the star would only be halved.
The Sun is the most powerful natural radio source from the perspective of the Earth, and when I was working for the National Radio Astronomy Observatory, I was taught not to observe anywhere near the Sun unless I was observing the Sun, itself. The VLA publishes recommended standoffs from the Sun while observing.
Not to say it is impossible to detect radio waves from an exoplanet, but I think it would take a very clever radio astronomer to extract the radio emissions from such a high noise floor imposed by the nearby star. If one could find a "rogue" planet without a host star, I imagine we could image it with a radio telescope. However, it might not be emitting much power without interacting with a star.