You can set up a report to use koolreport\datasources\PostgreSQLDataSource or \koolreport\datasources\PdoDataSource, then use your views in select query like tables:

class MyReport extends \koolreport\KoolReport
{
    public function settings()
    {
        return array(
            "dataSources"=>array(
                "automakerPostgre"=>array(
                    'host' => 'localhost',
                    'username' => 'root',
                    'password' => '',
                    'dbname' => 'automaker',
                    'class' => "\koolreport\datasources\PostgreSQLDataSource"  
                ),
                "automakerPdoPostgre"=>array(
                    "connectionString"=>"pgsql:host=localhost;dbname=dvdrental",
                    "username"=>"root",
                    "password"=>"",
                    'class' => "\koolreport\datasources\PdoDataSource"  
                ),
            )
        );
    }
    public function setup()
    {
        $this->src('automakerPostgre')
        ->query("SELECT * FROM my_view")
        ->pipe(..)
        ->pipe($this->dataStore(...));
    }

If there's any issue let us know right away. Tks,