change Laravel Eloquent database connection protocol parameter

I am using NeoEloquent OGM in my Laravel project for Neo4j database. Is there a way to change the default "http" protocol ro "bolt" protocol for Neo4j? The config/database.php file lets me change driver, host, port, username and password, but, I don't see how I can change the protocol, which defaults to "http", to "bolt".

via Chebli Mohamed