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Migrating ros1 package to ros2 and couldn't figure how to launch with a paramter in ros2.

With ros1 I have a launch file that refers to a config file and from cpp code I use node.getParam

launch file:

<launch>
    <arg name="node_name" default="collector" />
    <arg name="config_file" default="" />
    <node name="$(arg node_name)" pkg="collector" type="collector" respawn="true">
      <rosparam if="$(eval config_file!='')" command="load" file="$(arg config_file)"/>
    </node>
</launch>

config file:

my_param: 5

cpp code:

double my_param = 0;
n.getParam("my_param", my_param);

My question is how would that translate to ROS2?

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