When I put suggested code forward for the majority of the RIFF tags (see More Audio Format Metadata? - #2 by jules), I did a lot of research on WAV tags in general - iirc ID3v2 isn’t officially supported in WAV. And there being an obscene amount of possible tags to read, I’m not surprised JUCE isn’t going the whole way… It’s such an open ended beast!
That being said, if you find official documentation on how to lay out ID3 tags in WAV, I’d be curious to have a go at implementing it.