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As far as I now, in order to manage which nodes to run, when, and with which parameters, you create a my_project_bringup package that mainly contains a launch file.

Then all of your project can be started with ros2 launch my_project_bringup my_launcher.launch.py

https://docs.ros.org/en/foxy/Tutorials/Intermediate/Launch/Creating-Launch-Files.html

Is there a reason why this wouldn't suit you ?