Update

Assets/D.A. Assets/Figma-Converter-for-Unity/Scripts/Runtime/Assembly/LayerTools.cs

@@ -0,0 +1,35 @@
+using UnityEngine;
+
+namespace DA_Assets.FCU
+{
+    public class LayerTools
+    {
+        public static int AddLayer(string layerName)
+        {
+            int layer = LayerMask.NameToLayer(layerName);
+
+            if (layer != -1)
+                return layer;
+
+#if UNITY_EDITOR
+            UnityEditor.SerializedObject tagManager = new UnityEditor.SerializedObject(UnityEditor.AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/TagManager.asset")[0]);
+            UnityEditor.SerializedProperty layersProp = tagManager.FindProperty("layers");
+
+            for (int i = 8; i < layersProp.arraySize; i++)
+            {
+                UnityEditor.SerializedProperty sp = layersProp.GetArrayElementAtIndex(i);
+                if (sp != null && sp.stringValue == "")
+                {
+                    sp.stringValue = layerName;
+                    tagManager.ApplyModifiedProperties();
+                    break;
+                }
+            }
+#endif
+
+            layer = LayerMask.NameToLayer(layerName);
+
+            return layer;
+        }
+    }
+}