Celery adds a task dynamically to a chain

Question

I use celery 3 with Django.
I have a list of tasks in the database. The user can start a specific job that starts the celery task.
Now I want the user to be able to run several tasks, and he should add them to the celery queue and process them one by one not in parallel, as with async.

I am trying to create a task scheduler using celery, where the user can select the tasks to be performed, and they will be executed sequentially.
If I use chain(), then I cannot add new tasks to the chain dynamically.

What is the best solution?