If I create a project, in the introduction I can place a brand or logo that I have created and mention it as the developer, that is, as a brand of my domain.
I can’t give you legal advice directly on this. I can say generally you are certainly permitted to create and use your own original branding.
You can find explanation how to use Unreal Engine branding and corresponding materials here in Unreal Engine Branding Manual. You are free to use your logo and branding whatever way you see fit. Just be aware if you mix your logo with UE logos, there are some rules to adhere to and in general you should not mix this two. It is safer that way.
Refer to sections Documents and Logos in right panel.