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Get White balance multipliers

I would like to do white balance corrections with libRaw. It looks to me like there is built in functionality to use the rggb multipliers specified by the camera during the shot or use auto based on full frame or a rectangle.

I am trying to work out where to get the multipliers for other conditions. It seems like in my Canon CR2 raw files there is a list of multipliers for daylight, shade, tungsten, etc. Is there a way to extract these or directly use them with libRaw? If so is the method general (i.e. will it work for other file formats and camera models)?

From other forum posts it looks like there is not a straightforward way to convert from colour temperature and tint to rggb multipliers. Is this correct?

Thanks in advance