A pair of pings that could massively increase communication.

both pings are self based, so they really just need a prompt in chat and a sound.

an engage ping.

and a disengage ping.

these need to be separately rebindable, so you can use them very quickly, and the both refer to the player pinging only.

it could say something like,

elise is engaging

or

mordekaiser is disengaging

simple, increases communication immensely, is much more readable than using one of the other pings, and due to not needing to be targeted can be used when you engage or disengage more reliably.