Getting Unity Sprite Outline

DisplaySpriteOutline.cs

using UnityEditor;
using UnityEngine;

public class DisplaySpriteOutline : MonoBehaviour
{
    [SerializeField] private Sprite sprite;
    
    private void OnDrawGizmos()
    {
        TextureImporter textureImporter = (TextureImporter) AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(sprite.texture));
        var spriteOutlineProperty = new SerializedObject(textureImporter).FindProperty("m_SpriteSheet.m_Outline").GetArrayElementAtIndex(0);
        
        Vector2[] spriteOutline = new Vector2[spriteOutlineProperty.arraySize];
        for (int i = 0; i < spriteOutlineProperty.arraySize; i++)
        {
            spriteOutline[i] = spriteOutlineProperty.GetArrayElementAtIndex(i).vector2Value;
        }
        for (var index = 0; index < spriteOutline.Length; index++)
        {
            Vector2 vertex1 = spriteOutline[index];
            Vector2 vertex2 = spriteOutline[(index + 1) % spriteOutline.Length];
            
            Gizmos.DrawLine(vertex1, vertex2);
        }
    }
}