/cmd/arming topic not showing up in MAVROS

Hello everyone. I want to be able to arm my vehicle using MAVROS framework in ROS2. There is a SITL I’m connecting to, and I should be able to see /cmd/arming topic, but I cannot, therefore I’m unable to publish to this topic. What am I doing wrong or not taking into account?
The plugin command I think is loaded into MAVROS on startup as you can see on the image:

However I cannot see /cmd/arming topic using ros2 topic list.

I am using the humble version of MAVROS

If you have any idea, please feel free to share with me.