How would the playerbase feel for boss ability subtitles?

My reason? hear me out.

My brothers deaf and I LOVE nightmare so much, but he finds it hard as fully deaf, so he has to visual on the visual cues to see what spell the boss is casting, sometimes when people drag her away it's not the easiest thing to do in the world, So how would you all feel for adding a tiny little text bar saying what spell the boss is using? It doesn't have to say 'Mage attack' that would be easy, something like WOOSH for magic or CRACK for ranged? obviously this would require a lot of work for other bosses.