How to create custom Widget Views for Custom Modules

How can I create custom Widget Views for Custom Modules with only a part of the Item and without the standard Widget Designer View (Content, List, Detail)?

I'm trying to split up my Detail View in parts. For example, I need a View for only the Title, the Summary and the Text (and so on) so I'm able to design my Detail Page in the Back End and I don't have to design it in the Detail.CustomModule.cshtml.

Does someone understand me / can someone help me?