More than zero. It's called closed captioning, isn't it? I've quite often seen closed-captioning that put brief written descriptions of non-verbal depictions in bracket, and it's not entirely common either

https://www.automaticsync.com/captionsync/what-qualifies-as-... (see section: "High Quality Captioning")

Close captioning is for people who can’t hear.

I am not aware of many TV shows that offer audio commentary for the visually impaired.

Here is an example of one that does.

https://www.npr.org/2015/04/18/400590705/after-fan-pressure-...

Sorry, I thought that since we were originally talking about transcriptions of radio news broadcasts and accessibility for the hard of hearing that closed-captioning would be appropriate and relevant. But your point is well met.