Try to reproduce emberjs/ember.js#19877

tests/dummy/app/helpers/service.js

@@ -0,0 +1,8 @@
+import { getOwner } from '@ember/application';
+import Helper from '@ember/component/helper';
+
+export default class GetService extends Helper {
+  compute([name]) {
+    return getOwner(this).lookup(`service:${name}`);
+  }
+}

tests/integration/gjs-test.gjs

@@ -4,6 +4,7 @@ import { render } from '@ember/test-helpers';
 import { precompileTemplate } from '@ember/template-compilation';
 import Component from '@glimmer/component';
 
+import GetService from 'dummy/helpers/get-service';
 import GjsTest from 'dummy/components/gjs-test';
 
 module('tests/integration/components/gjs', function (hooks) {
@@ -49,4 +50,19 @@ module('tests/integration/components/gjs', function (hooks) {
 
     assert.equal(this.element.textContent.trim(), 'Hello, world!');
   });
+
+  test('it works with ember helpers', async function (assert) {
+    await render(
+      precompileTemplate(`
+        {{#let (service 'router') as |router|}}
+          {{router.currentRouteName}} hi
+        {{/let}}
+        `, {
+        strictMode: true,
+        scope: () => ({ service: GetService }),
+      })
+    );
+
+    assert.equal(this.element.textContent.trim(), 'index hi');
+  });
 });