Explanation
To add a Power BI report to a model-driven app, you should add it to a dashboard. Dashboards in model-driven apps provide a way to organize and display information, such as charts, tables, and reports. You can add a Power BI report to a dashboard by creating a new dashboard and then adding a Power BI report component to it. This component allows you to specify the report you want to add and configure its properties, such as size and layout. Users will then have access to the embedded report when they view the dashboard in the app. Reference:
https://docs.microsoft.com/en-us/power-platform/admin/create-model-driven-app-dashboards