Average pace alert - struggling to setup

Hi - recently bought a Forerunner 970 - love it so far.

Really struggling to set up a running audio pace alert that I want - can't seem to get it work the way I'd like. Quite simple, but can't figure it out:

All i want is 

Every 1 mile, give me my pace of that mile i've just completed

"ie last lap, X mins"

thanks for your help