Why is there no Collision2D.Impulse? (Calculating the force needed to break an object)

I found a solution that seems to be fine. Summing the normal impulse of each of the collisions contact points seems to do the trick. I don't know if this is exactly identical to collision impulse, but for my purposes it seems to work. I still think Unity should implement Collision2D.Impulse

Here's my code:

 private void OnCollisionEnter2D(Collision2D collision) {
         ContactPoint2D[] contacts = new ContactPoint2D[collision.contactCount];
         collision.GetContacts(contacts);
         float totalImpulse = 0;
         foreach (ContactPoint2D contact in contacts) {
             totalImpulse += contact.normalImpulse;
         }
         Debug.Log(totalImpulse);
     }