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In regards to passing it directly to the ros2 node, you're missing the -p to notify that this is a parameter being passed:

sh ros2 run test_param_pkg test_node.py --ros_args -p custom_param:="my_very_custom_param"

In regards to the launch file failing, the warning Parameter file path is not a file: custom_parammy_very_custom_param suggests that you entered the launch command incorrectly, try and run the same command again:

sh ros2 launch test_param_pkg test_param.launch.py custom_param:="my_very_custom_param"