The smart narrative visualization helps you quickly summarize visuals and reports. It provides relevant innovative insights that you can customize.
Use smart narrative summaries in your reports to address key takeaways, to point out trends, and to edit the language and format for a specific audience. In PowerPoint, instead of pasting a screenshot of your report's key takeaways, you can add narratives that are updated with every refresh. Your audience can use the summaries to understand the data, get to key points faster, and explain the data to others.
Reference:
https://docs.microsoft.com/en-us/power-bi/visuals/power-bi-visualization-smart-narrative