There is no 'RAW' format as such. In practice, 'RAW' is a jargon term for "camera specific format with basically raw sensor readings and various additional information". Typically the various RAW formats don't embed the spectral information, just a camera model identifier, because why waste space on stuff the camera makers already know and will put in their (usually maker specific) processing software.
(Eg Nikon's format is 'NEF', Canon's is 'CR3', and so on, named after the file extensions.)
I don't know if DNG can contain (optional) spectral response information, but camera makers were traditionally not enthused about sharing such information, or for that matter other information they put in their various raw formats. Nikon famously 'encrypted' some NEF information at one point (which was promptly broken by third party tools).
(Eg Nikon's format is 'NEF', Canon's is 'CR3', and so on, named after the file extensions.)
I don't know if DNG can contain (optional) spectral response information, but camera makers were traditionally not enthused about sharing such information, or for that matter other information they put in their various raw formats. Nikon famously 'encrypted' some NEF information at one point (which was promptly broken by third party tools).