How do I use scriptrunner's addedAfterSprintStart function for previousSprint() or openSprints() ?

[Ashwin Nair]

How do I use scriptrunner's addedAfterSprintStart function for previousSprint() or openSprints() ? I'd like to call

  issueFunction in addedAfterSprintStart("Sprint Board", "Sprint Name")

 without actually using the sprint name. How could I replace it with something like

  issueFunction in addedAfterSprintStart("Sprint Board", previousSprint("Sprint Board"))

OR

   issueFunction in addedAfterSprintStart("Sprint Board", openSprints())