This would be useful because, as far as I can tell, the troves spawn not where you kill the nemesis, but where they spawn, which could be some distance away from where they finally die (especially if you’re a ranged character kiting the nemesis away).
This is especially the case for Chthonic rifts which have very few landmarks and everything kind of looks the same - I killed the nemesis there earlier and spent a good 3-4 minutes just trying to track down where the trove was.
While developers consider whether it’s worth implementing or not, you may try the recently released GrimTools map to recall where you could had met a nemesis that you kited for so long.
That’s super useful, thanks! I’d probably have to keep it open on my other laptop while I play, but I suppose it’s the next best thing to having it in-game.