Your highest approval companion could ask about you in a way that feels organic and (hopefully) cathartic.
Second is what to do about it. Once you've confirmed the theme with your player, there's no ignoring it, the the story has to pivot to that theme. Maybe you get special options … or special dialogue options during romances where Tav and their partner can share their grief as fellow survivors.
That would be totally awesome! It would kind of be the culmination of what I see as special in BG3.
There’s already a special ending for „just let Gale explode“, so it would be great to have this theme take center stage if it comes to it.
(I pulled this part out from the spoiler, because I think I removed all that needed a spoiler, and this way more people can see it — I hope I got that right)