Choose annotation name from dropdown

Is it possible to define the names that can be used for annotating so they can be choose from a dropdown?

Start by locating the annotation-name input and the surrounding annotation UI in the JavaScript application. Check how annotation names are currently entered, then define the expected list source and selection behavior; done means users can choose permitted names from a dropdown while creating annotations.

索引モデルが issue の本文から書いたものです。