Using PowerApps to update Power BI data

I'm looking to create a dashboard in Power BI that enables, based on the data presented, a user to make a number of choices. Ideally I want these choices to be stored so that next time they log into Power BI and view the report they see the data with the choices they made the previous time. These choices will be related to and different for each row in the dataset.

I've looked at doing this through the new what if parameters however these cannot be different for each row of data and are not persistent between sessions.

I have also looked at doing this through Power Apps, embedding the app in a Power BI dashboard and using text and number inputs in the app to make the different choices/selections needed. This is then passed to a Flow and can update an Excel workbook (or anything else Flow can connect to). The issue I am having is that Power BI can only look at the workgroups OneDrive whereas Flow seems only to be able to access my personal OneDrive. Is there something that they can both access which I can use flow to update a workbook/data source which is being read by Power BI?

Thanks,
Richard