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same i cant find it anywhere... their is no way to put it to your node? you can only put whole launch files with

parameters= ["path/params.yaml"]

and if you want to just add a normal argument with:

arguments= ["test"]

you can but if you want to parse it from your launch file its just yikes since you cant just give a normal argument to the launch command it has to be:

arg1:= test

you have to do some big yikes stuff in python like getting argv[position] and than split on := get the second part and than use that in the arguments array and than in your main you have to do argv[position'] again.....