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

Note: Some terminology has changed. Entity is now Table. If you're building a Canvas app, you must use table (entity) as the scope.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/data-platform-create-business-rule

You can trigger on-demand workflows from inside a business process flow. For example, you can add an on-demand workflow to a business process flow so that an activity, such as a task or email, is created whenever a stage is completed.
Note: A workflow becomes activated based on where you drop the workflow onto the business process flow designer.
On-demand stage processes. When the workflow is dropped onto a business process flow stage, the workflow is triggered on entry or exit of the stage.
Reference:
https://docs.microsoft.com/en-us/power-automate/bpf-add-on-demand-workflow