Hello @CucuSetiawan
You can model that kind of bend using free form rebar.
It will, however, report the length of the entire bar, as if it were delivered straight, because that geometry is not compatible with Revit rebar shapes and free form rebar shape matching will not work for this situation
Using the Aligned Distribution, you can create a structural element with that shape (extrusion from a sketch containing that spline at the corner), select the faces and an edge as the distribution path.
This is what this simple example looks like


I've attached this simple example rvt file
Alternatively, you can use Dynamo to create any curve or succession of curves and produce a free form rebar in Revit from it.
You can use the Structural Design package which already has nodes defined for creating free form rebar.

Ovidiu Paunescu, M.Sc. Str. Eng.
Sr. Product Owner | Autodesk Revit