nomad/ui/app/controllers/allocations/allocation/task.js

import Controller, { inject as controller } from '@ember/controller';
import { computed } from '@ember/object';

export default Controller.extend({
  allocationController: controller('allocations.allocation'),

  breadcrumbs: computed('allocationController.breadcrumbs.[]', 'model.name', function() {
    return this.get('allocationController.breadcrumbs').concat([
      {
        label: this.get('model.name'),
        args: ['allocations.allocation.task', this.get('model.allocation'), this.get('model')],
      },
    ]);
  }),
});