Fold/Roll/Fade Animation with Timeline

Hello!
I am currently struggling to rebuilt my animations using the timeline.
My current approach is the “dumb” approach using the show/hide commands and the effects. I did setup the timeline by adding in the absolute delays. However due to the size of the animation - I guess it would be more clean to use the timeline for stop/replay actions.

However, I have not found any clean way to have fold/roll/fade animations rebuilt using the timeline.
One problem e.g. is that the target value for scale is 1 and the source value cannot be set - How can I increase the scale of the objects from 0 to 1 then? Do I really have to add in a scaling function before running the timeline?
Fade-out is working, however same problem with the “targetvalue is 1”, I cannot achieve a fade-in animation.

Can somebody help me here?