Showing a popup as a feedback when executing a process

We have some “Administration” processes which are only executed by IT operations by using the Camunda cockpit (tasklist -> start process). These processes only have 1 service task (implemented in Java).
The processes work fine, but IT operations want to have a direct feedback when the process was executed successfully.
The feedback should be a browser popup or a website which shows up.
Which is the easiest way to implement this requirement?
We tried to make a javascript script task which shows a popup (like window.alert (“process was executed with result = …”):wink: but this does not work.
Any ideas?

Duplicate of Direct popup feedback when executing processes