Specific wireframe edges highlight

Hello everyone. I want to get toony look of my model in Unity like in cartoons.

Standard toon shaders do not give this effect, they just outline a mesh. I used some wireframe shaders but they also show unnecessary edges. I wonder is there any way to highlight only that edges that i want to. Also i can reach this by adding additional polygons and making them black or by drawing lines directly on the texture but these methods have cons, when we look at the model close lines are too big, if look from far they even can not be seen.

Some 3d softwares, like sketchup shown on the image, show model in viewport in this way.

Any help would be appreciated. Thank you for your attention.