In theory, DNG converter, unless it’s old enough to have the same issue as what USUALLY happens for an unknown camera in RT, will inject color profile data into the DNG. Obviously if the camera is so new that DNG converter doesn’t have a color profile for it, you’re hosed until you get a colorchecker. DNG Converter does more than put the bayer data in a DNG container, if the camera is known, DNG Converter will inject the color matrix data too.
(Some people use DPReview’s studio scene as a basic rough color calibration, but keep in mind that a daylight-balanced LED, even a really good one, is still not actual daylight. But for most use cases it’s at least much better than nothing.)