kAudioChannelLayoutTag_TMH_10_2_full has HI and VI channels

In Core Audio, there is a description saying there are those two channels in kAudioChannelLayoutTag_TMH_10_2_full: HI and VI

These are not described anywhere else, including in the list of channel abbreviations.

Anyone knows what they are really?
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I did some googling and my current guess is that these channels contain content for

Hearing Impaired (with emphasis on dialog)
Visually Impaired (audio description)

The mention I found was https://www.isdcf.com/papers/ISDCF-Doc4-Audio-channel-recommendations.pdf, which doesn't seem related to the THM format (but documentation for that seems to be rather sparse) but still related to multi-channel audio.
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maven
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I did some googling and my current guess is that these channels contain content for

Hearing Impaired (with emphasis on dialog)
Visually Impaired (audio description)

The mention I found was https://www.isdcf.com/papers/ISDCF-Doc4-Audio-channel-recommendations.pdf, which doesn't seem related to the THM format (but documentation for that seems to be rather sparse) but still related to multi-channel audio.
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maven
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Thank you Maven for the reply!

I am unsure whether this is the good answer, as it has nothing to do with TMH, but until someone authoritatively says it's something else, I'll give your Checkbox! Waited 1 month to give some chance.
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