Feature Request

When parameterising a pipeline using ((placeholders)), is there any way to provide defaults for these parameters, such that they become optional with set-pipeline? I have a pipeline that uses parameters with include paths for build steps (e.g. file: pipelines/((project_type))/test.yml) - depending on what file you end up loading you might need some parameters, and would like to avoid declaring a bunch of empty parameters for the "types" where they don't apply.