I FUCKING DID IT

Added a helper component for managing a list of strings.
This component could, in theory, also be turned into a generic one
for any type of data

frontend-reactive/app/routes/registerform.ts

@@ -0,0 +1,9 @@
+import Route from '@ember/routing/route'
+
+export default class RegisterFormRoute extends Route {
+  async model() {
+    return {
+      list: [{ value: 'one' }, { value: 'two' }],
+    }
+  }
+}