Simple But Diffcult Problem - How to Dynamically assign Target path name based on pipeline paramter

If the dynamic nature of the pipeline parameter depends on the consumer/caller of that pipeline, then you could try something like when such pipeline is created as a task - say if it is an API task in the form of Ultra task. The consumer of that task should passed the needed value that will override what's there in the pipeline-parameter or task parameter. That's one possible way having a dynamic pipeline parameter. Otherwise, it takes what's is defined in the pipeline parameter - that's what I have seen when I work with pipelines.