Overriding core files in suitecrm 8.5

I followed the documentation and adjusted extensions/defaultExt/app/src/ to create a custom sidebar widget, it was successful and is displaying on page.

Now i am trying to override the original Login files i.e of “core/app/core/src/lib/views/login/components/login/”
with same procedure and kept my new custom login files inside extensions as “extensions/defaultExt/app/src/views/login/components/login/”

Based on documentation, sidebar widget was needed to be registered in extension.module.ts in order to make it render and working but how to register this “login” in extension.module.ts “extensions/defaultExt/app/src/extension.module.ts” or what should i do next to override my original login files after this all steps.