There is no standardized parameter for this in (BWF) wav files. If Reaper can do that, then it uses a container that is also used for texts or notes, for example.
You should have an example and then take a look to the tags and check in which container this data must appear and in what form.
Probably the iXML container. But there is also Riff, BWF, AXML, ID3v1 / ID3v … and others.
Then you would have to enter this information into the containers yourself. WaveLab can do this very well.
Nuendo is completely unsuitable for handling / importing / exporting this metadata.