It is in the Eula.
Though, for stylistic purposes it’s probably better if you don’t. It may also come off as cheap.
" 1. What Technology Epic Is Licensing to You
The Licensed Technology licensed to you under this Agreement includes all Unreal Engine code and related content that is copied to your computer when you install Unreal Engine. This includes Engine Code, Examples, and Starter Content."
" ‘Examples’ means the code, artwork, or other content made available by us in the Samples and Templates folders in the install directory."
“c. Use by End Users, Publishers, and Distributors
When you Distribute a Product, you may permit end users to use, reproduce, display and publicly perform the Licensed Technology”