How to setup variables for a kernel?

[bharatk-meesho]

I am not able to find any concrete documentation for this project. I want to use beakerX to sql notebooks by connecting them to presto. I installed beakerx and I am able to connect to presto using the driver, however I don't want to expose connection detail in every notebook (presto credentials and config would be same for every notebook). How can I make use of variables like BEAKERX_SQL_DEFAULT_JDBC or where can I find of available variables and information on how to setting them up globally?