Have you tried to use Robot, like to hit the Enter button:
import java.awt.Robot
import java.awt.event.KeyEvent
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_ENTER);
robot.keyRelease(KeyEvent.VK_ENTER);
If there is more to what you need to do, then keep looking outside of Katalon forum for other sites that use Selenium and see if they offer something.
Note: You cannot use the mouse or keyboard when you are using the Robot as that is what it is trying to “use”.