Loading controllers from yaml in namespace

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Hi,

(*Using ROS Melodic in Ubuntu)

I am loading a yaml with 4 controllers + joint_state_controller in a namespace. Yaml aspect:

ch1_joint_state_publisher:
  type: "joint_state_controller/JointStateController"
  publish_rate: 50

ch1_controller_ur: 
  type: "effort_controllers/JointEffortController"
  joint: "joint1"

....

Then, I try to spawn them using a controller_manager node. However, the node only finds the rosparam if I explicitly put the namespace, like that:

  <rosparam command="load" file="$(find ch1_simulator)/controllers/wheels_controllers.yaml"
    ns="ch1_controllers"/>
  <node name="ch1_controller_spawner" pkg="controller_manager" type="spawner"
    args= "/ch1_controllers/ch1_joint_state_publisher
    /ch1_controllers/ch1_controller_ur
    /ch1_controllers/ch1_controller_ul
    /ch1_controllers/ch1_controller_br
    /ch1_controllers/ch1_controller_bl"/>

However, the node is not able to find the param by using the --namespace arg:

  <rosparam command="load" file="$(find ch1_simulator)/controllers/wheels_controllers.yaml"
    ns="ch1_controllers"/>
  <node name="ch1_controller_spawner" pkg="controller_manager" type="spawner"
    args= "--namespace=/ch1_controllers 
    ch1_joint_state_publisher
    ch1_controller_ur
    ch1_controller_ul
    ch1_controller_br
   ch1_controller_bl"/>

I would really appreciate any clue about it or what I am missing thereof.

Regards,

J.L Samper