You can't. You need to pull the gateway logs for that, separately from each cluster member, and then glue them together.
These logs are notoriously hard to read. In addition they are reporting on Data Source refresh, not necessarily dataset refresh. You need to go hunting for "ObjectId" in column 8. That is the dataset ID.
Do you have a link to these e.g. github or similar?
Would have thought scheduled report audit woudl have been visible via admin panle in power bi - perhaps in future - agree woudl be useful for microsoft tp have specimen templates, reports for common amdin tasks such as this.
If your data source is in the cloud and you don't allow the gateway to handle those refreshes then the gateway logs will not give you the complete picture. You may want to use the audit logs instead if you are only interested in refreshes (but not in who handled them)
I prepared a blog article on gateway logs, should be out in a week or so.