Step 1 (B): Here's how we embed PowerApps into a Power BI report:
Download and login to the Power BI desktop application
Click on (...) and select "Import from the marketplace."
Step 2: Open Power BI desktop and use "Get data" to connect with the Common Data Service data source.
Step 3: Publish the report to Power BI service.
Reference:
https://purple.telstra.com/blog/powerbi-integration-with-powerapps

Explanation:

A gallery control in Power Apps allows you to display a list of records, and can be configured to sort the records by a specific field, such as category. Additionally, the gallery control has built-in functionality for expanding or hiding a list of subtopics. This can be done by adding a toggle control within the gallery template to show or hide the subtopics based on user interaction. Reference: https://docs.microsoft.com/en-us
/powerapps/maker/canvas-apps/controls/control-gallery

When you create a Power Apps app for Microsoft Teams using Microsoft Dataverse for Teams, the app needs to be added to the app bar in Teams before it can be accessed by users. This can only be done by a tenant administrator. To ensure that users can access the app, you would need to request that the tenant administrator pin the app to the app bar in Teams.
Sharing the app with a security group by using the Maker portal (A) or in Teams (B) would allow users in that group to access the app, but they would still need to be able to find and open the app.
Here are some references from Microsoft that may be helpful in understanding how to make Power Apps app available in Teams:
* Microsoft docs: Add a Power Apps app to a Microsoft Teams channel
* Microsoft docs: Pin a Power Apps app to the app bar in Microsoft Teams
* Microsoft docs: Distribute Power Apps for Microsoft Teams

Reference: https://docs.microsoft.com/en-us/power-apps/maker/portals/create-common-problems
https://docs.microsoft.com/en-us/power-apps/maker/portals/create-portal
https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal- portal#required-permissions