プレビューのヘッダーを自由にカスタマイズしたい場合にオーバーライドして使用します
The default implementation is a no-op. Note: Inspector previews are limited to the primary editor of persistent objects (assets), e.g., GameObjectInspector, MaterialEditor, TextureInspector. This means that it is currently not possible for a component to have its own inspector preview.