>  I need to retrieve a result of the the notebook task

If you want to know if the task run has succeeded or not, you can enable the "lakeflow" system schema and you'll find the logs of jobs and task runs.

You could then use the above info to execute an SQL query against the logs in a task after you job query task.

In any case, you should provide a better description of the problem you are trying to solve to help people understand what you are trying to achieve.