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A workaround that can be used in the XML format is the tag <let>. This tag works in galactic with the argument "if". Your launchfile would then look like this:

<let name="x" value="true" if="$(var condition)"/>
<let name="x" value="false" unless="$(var condition)"/>

<node .......>
  <param name="x" value="$(var x)"/>
</node>

It uses a little bit more lines but I think it's a useful method if you don't want to rewrite all of the file in Python