The add-on is bundle with necessary drivers so you don’t need any driver to connect to MS SQL Server. But due to licensing issues, we only bundle open source JTDS Driver for MS SQL Server. You can use following URL as template:
You can find more details on syntax here https://docs.microsoft.com/en-us/sql/connect/jdbc/building-the-connection-url?view=sql-server-2017
If you want to use another driver, you can add it yourself as explained here. It shows how to do it for Oracle’s JDBC Driver but procedure is valid for any JDBC Driver.