My controller.yaml file looks like

controller_list:
  - name: ""
    action_ns: follow_joint_trajectory
    type: FollowJointTrajectory
    joints:
      - joint1
      - joint2
      - joint3
      - joint4
      - joint5
      - joint6

how can I change it to use JointGroupVelocityController Is this the right way to change the controller or I need to do something else. I am editing the controllers.yaml file for my robot