Thank you for your answer. If I understand right, there is no way to connect out of the box with the power apps component framework to other services like in a canvas app? I have seen examples were model-driven apps using different data sources like project online, Azure DevOps and SharePoint. Or the office 365 data for receiving user pictures.
So what is the best way to achieve this? Do I have to do authenticate to use them again when he opens the app to use his token for craft requests? Or is there another elegant way?