Can I add additional region in contract overview page

Summary:

It is possible for me to add a custom region like "Contribution". Then I can move some of the fields from overivew summary into this region.

Content (please ensure you mask any confidential information):

I try to copy showDetailHeader, but it is not allow to copy. You can only use cut and paste. It means you can move to different place. But you are not able to create additional region.
Version (include the version you are using, if applicable):

25A
Code Snippet (add any code snippets that support your topic, if applicable):