Notify Mobile App sound Automation

I’ve connected a set of IR Beams across the gate, connected to a Zigbee water leak detector, the water detector send a message to a wall mounted iPad with Sends a notification message using the mobile_app_XX integration. so that works.
I want to trigger a custom sound have created as a test this that works fine. Can not work out how to tie the two together, any ideas? thanks
alias: “Notify Mobile App sound1”
service: notify.mobile_app_graemes_ipad
message: “Your Roommate arrived”
name: “US-EN-Morgan-Freeman-Roommate-Is-Arriving.wav”
critical: 1
volume: 1.0
any idea on how to do this?