Custom 404 page

Hi,

I see the 404 page is standard boring wp 404.php page that can be edited via the root directory of my website theme folder. Your theme is very creative but this 404 page is far from it. Is there a way to create a 404 page within the admin > page ~ part of the website.
Like my Avada theme i have a custom 404 page which I can play with inside my wp admin area and style it the way I like. How can I do this with your theme? ( Boldial )