The express Generator is a tool for creating and setting up an app. It creates the basic application structures, configures the preview engine, css engine, tooth others, but ends with this.
Once I command you express -v pug -c sass projectoName
is executed, the express-Enerator finishes his work.
To create new views (views), complete or partial, you need to create a new file manually.
Frameworks such as Ruby on Rails, for example, can generate views, models, or structure (scaffold) a full CRUD.
There are other frameworks, such as Sails,js (based on express.js), who have the command sails generate page
which does what is proposed in the question: Create a view the structure of it.