The copilot summary in the subscriptions is really bad.

Customer is using Copilot Summary feature in Email subscription as per document: Add Copilot summaries to email subscriptions - Power BI | Microsoft Learn.

However, the summary provided is not helpful and not in a useful format.

Also, there is no user defined prompts available as this is a limitation.

Requesting for user defined and better copilot summary in the upcoming releases.