WRITING ON UR5 using topics

According to the guide Usage — ur_robot_driver documentation
we executed the default trajectory example. Everything is well configured.
We mean this script:

ros2 launch ur_robot_driver test_scaled_joint_trajectory_controller.launch.py

As we could what we have learned, the test_scaled_joint_trajectory_controller is reading from a yaml file. We would like to send or write commands in UR5 in real time using topics, but we could not find any example of this.

Can you give has some indication, please?

thanks a lot.