Shader for Outline Contour Points

Hi everyone, I have a project about instance segmentation which requires to create contour around certain objects. I am currently using OpenCV for detecting edges for every mesh but it feels like workaround because first I am saving texture as grayscale then find contours with OpenCV from these images like above

Contour Image

I have searched shaders for finding silhouttes and outlines but none of them gives me outline contour world or screenspace points for a mesh and I don't really need visualisation. So I need a shader which gives me coordinates of outline contour.,