Answer
Yes — a Materialized View can be included directly in a module's Core, Extension/Localization, or Customization views source file, the same general place as regular view definitions. IFS's own code generator then automatically produces the deployable APV file including that Materialized View definition, following the same standard code-generation/deployment process as any other database view. Refer to IFS's Foundation1 development documentation under Code Generation, in the Core Server / Base Server Development / Development Concepts section, for the full details of how this works.