I added an object - plane, rectangle. Went to edit mode and deleted 3 edges, left only one. Exit edit mode and added screw modifier to this edge. This way I can animate drawing of circle with changing angle of screw modifier.
Since I need that this animation be rectangle and not circle, I added cube, hidden and not rendered. This cube is object for Boolean Intersect modifier for Edge.
With some Shift+D, little materials here and there, etc. final product is this:
Is there any chance that I can add text on grey rectangle which would also radial sweep appear? I'm googling all day and cannot find a way (newbie :) ).
One important thing - project is in Eevee, not in Cycles.
Thanks in advance.