Nu-HTML warning - Aria-label with horizontal rule?

Hi:

In our work within disability services, we are trying to develop a method
in HTML which will help our students distinguish secondary text content
from primary text content.

One thought we had was to use the horizontal rule between these two areas
and to announce to the screen reader user the beginning of "extra content".
This way the student can jump over that content if they wish.

Would it be possible to use an aria-label inside a horizontal rule without
receiving a warning message with the Nu-HTML checker?

I have attached a file.

Thank you,

Joseph

-- 
*Alternate Media Supervisor*
Disabled Students' Program
University of California, Berkeley
https://dsp.berkeley.edu/
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