I’m not sure that is possible. All tracks in a pattern will be on the same signature as far as I know. But you can vary the signature from pattern to pattern.
Swing is applied to a whole pattern. EDIT: just read in the manual that you can then alter it for individual trigs (page 42).
One of its limitations is that tempo is global to a project. You can change it by altering the time signature in a pattern (page 39 in the manual), but you can’t change it gradually programmatically as far as I know. You would have to do that live when it is playing.