I don’t think you can get realistic looking animated line bends using the ‘Morph’ feature.
You can move objects from one position to another, but using a straight line/curve and bending it with the Morph doesn’t work for me. Perhaps I’m not doing it right.
However, using conventional, time-consuming methods do work – slides with incremental changes in each slide and made to appear after a short time period.

Something like this, created in Powerpoint 2016: