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For now I went with the ugly way and modified some files in

/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/

The summary is printed in parent.py and most of the other stuff by the functions printlog() and printlog_bold() in core.py. The rest is found in launch.py and __init__.py.

Anyway I will leave this post open, since the solution is not pretty and applies to all the nodes running on the computer.
Would be nice if someone has a better solution, even though the code does not look like as hiding the summary by config file is considered.

Cheers