Try using the NiFi REST Api to fetch the desired information 😁

You can get a list of all your reporting tasks by executing a call on the following link: https://<hostname>:<port>/nifi-api/flow/reporting-tasks
This will provide you with a JSON list of all your reporting tasks.

If you want to go in a specific reporting task, you need to make a call to:
https://<hostname>:<port>/nifi-api/reporting-tasks/<id-of-controller>

You can go ahead and play with the api calls until you fetch the perfect data for you. All the available calls can be found here: https://nifi.apache.org/docs/nifi-docs/rest-api/index.html