Maybe let s put it in a different way:

Pipeline
Preprocess Task Main Task Postprocess Task
My main task is my experiment, so my training code. When I ran the main task standalone, I just used Task.init and set up the project name, task name, etc.
Now what I could do is push this task to the server, then just reference the task by its task-ID and run the pipeline. However, I do not want to push the main task to the server before running. Instead I want to push the whole pipeline, but still be able to run my main task standalone. So in the end, whether I run the task as part of a pipeline or as standalone should not show different on the clearml-server.