In our FCTM A320 under AEP-MISC-EMER EVAC:
"EVACUATION…INITIATE requires the captain confirmation that the emergency evacuation is still required. If still required, the captain notifies the cabin crew to start the evacuation.
The F/O advises the ATC."
After RTO we use the same Task Sharing:
CM1 initiates the evacuation via PA. In the meantime CM2 makes the call to ATC.
LW20