Business critical service tier provides one free-of-charge readable replica of the database that can be used to run read-only queries such as reports and analytics. Learn more about Business Critical tier here. Azure SQL DTU premium tiers have also the same feature of free readable replicas. You can enable this feature using the portal:
You can make changes to reports on the connection string with "ApplicationIntent=ReadOnly" parameter to make them connect to the read-only replicas.
If you are not able to pay for premiun tiers to get free access to a read replica, you can create a replica using Azure SQL Data Sync but you will have to pay for the replica database.