Explanation
Box 1: Embed a Power BI report in a model-driven app
You can embed a Power BI report in a model-driven app main form.
Box 2: Use the Power BI service.
The Power BI cloud service works with Microsoft Dataverse apps to provide a self-service analytics solution.
Power BI automatically refreshes the app's data displayed. With Power BI Desktop or Microsoft Excel, Power Query for authoring reports and Power BI for sharing dashboards and refreshing data from model-driven apps, your users have a powerful way to work with your app's data.
Reference:
https://docs.microsoft.com/en-us/power-apps/maker/model-driven-apps/embed-powerbi-report-in-system-form
https://docs.microsoft.com/en-us/power-apps/maker/model-driven-apps/use-power-bi