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For relative path use this just change MY_PACKAGE to your package name. Tested on Noetic:

<launch>
  <arg name="bag_file_name" value="my_bag"/>

  <node pkg="rosbag" type="play" name="rosbag_play" output="screen" args="--clock $(find MY_PACKAGE)/bags/$(arg bag_file_name).bag"/>
</launch>