How do i unroll this surface to get the paper pattern?

I have this object how do i get the paper pattern of it?

A surfce with that shape will not “unroll” flat without significant distortion. A surface needs to be “developable” to unroll flat without distotion.

You can try using Squish or Squash to flatten the surface and decide if the distortion is acceptable.

A related thread: How do I unroll this surface? Paper Mock Up