discourse-subscriptions/assets/javascripts/discourse/routes/admin-plugins-discourse-subscriptions-plans-index.js

import Route from "@ember/routing/route";
import AdminPlan from "discourse/plugins/discourse-subscriptions/discourse/models/admin-plan";

export default class AdminPluginsDiscourseSubscriptionsPlansIndexRoute extends Route {
  model() {
    return AdminPlan.findAll();
  }
}