[ROS 2] In launch file, set parameter based on value given to another.

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Hi there.

I am trying to create a launch file where some of the parameters are set based on the value given to others, so I can avoid having multiple launch/parameter files.

A minimal example looks as follows:

Node (
    package = 'package',
    executable = 'executable',
    parameters = [
        *uri to parameter file*,
        {
            'param1' : LaunchConfiguration('param1', default = 1),
            'param2' : ****
        }
)

I need param2 to be equal to param1 == 2.

It would be useful to extract the boolean value of a LaunchConfigurationEquals condition, but I haven't been able to find how to do that. I believe that's what the parsers in frontend are there for, but I don't understand how they work.

Thanks in advance.