Why don't we have the option to mark explosive barrels, loot chests or that medpack we dropped on the ground?

I think it would be very useful to mark where an explosive barrel is, since it is a potential instant death hazard!

We can mark the ammo crate that was dropped, why can't we do the same with the medpack?

Sometimes the loot chest is far from me, but it is close to another player.

I would like to mark the chest instead of spamming that ping that is so annoying that it is ignored by many players.