Show enemies remaining before boss spawn or gates open

Can we have something that let us knows when we killed enough mobs for the boss to spawn or the gates to open? Would be so useful, like we could have a mobs counter that says how many mobs left to kill for the boss/gate to open, or any other system idk, lmk what you think about it as usual any constructive suggestion is welcome :)

We have this for some dungeons (labyrinth), but based on the way encounters are constructed, sometimes this doesn't make sense.

That said, as it stands now, we have no plans to do this.

-ALS