Change datasource after publish from on premise to azure sql db

I've created some reports, for which I used an on premise sql server as datasource (Import). 

I used parameters to define the sqlserverInstanceName and DatabaseName.

I can publish and use these reports on app.powerbi.com.

But now I would like to schedule a refresch in app.powerbi.com and get the data from an Azure Sql DB.
Is this possible, or do I have to use Azure SQL DB as a source in power bi desktop before I publish my reports ?