Trigger automation when dashboard is updated

I have a screen in kiosk mode has my HA dashboard. when I update the frontend, I get the message. This is triggered by an event, I assume a change on the ui-lovelace.yaml file.

The Lovelace UI configuration for this dashboard was updated, refresh to see changes?

I have created a small script on my kiosk that listens to an MQTT topic and refreshes the browser page as needed. I can send a message from HA to trigger that script.
what I want to do now is for the change in the ui-lovelace.yaml to trigger an automation that sends that MQTT message.

however, I cannot find the appropriate event to trigger this. It seems it must be there, but where is it?

Here is an trigger configuration example

platform: event
event_type: lovelace_updated