This is a paid asset, but now you can download Curvy Text Free.
Detail this asset from Unity Store: Original Link
Curvy Text v1.0.2 (Latest version)
Curvy Text allows the text to follow a path.
In the Unity Editor, you can create the the curvy text through this menu: Game Object > UI > Curvy Text.
(A) Enable Editor Tools.
(B) This will show a tools window in the scene view.
(C) Use the tools in the scene view to modify the curve.
The Freeform tool allows you to add new points, to remove points, insert points and control points
Insert Points tool allows you to insert a point between two other points.
Remove Points tool will remove a point.
Convert Point tool gives you the possibility to control the curve betwee two points.