How can I use Angular schematics insert an element into array?

Question

I am using Angular schematics to generate component automatically. There are 3 things I want to do:

1. import component in module (done)
2. insert something(such as '11') into an array
3. add case code into switch

I have achieved the point one by addImportStatement as blow.

function getTsSourceFile(host: Tree, path: string) {
  const buffer = host.read(path) as Buffer;
  const content = buffer.toString();
  const source = ts.createSourceFile(path, content, ts.ScriptTarget.Latest, true);
  return source;
}

export function addImportStatement(tree: Tree, filePath: string, importName: string, importPath: string): void {
  let source = getTsSourceFile(tree, filePath);
  const importChange = insertImport(source, filePath, importName, importPath) as InsertChange;
  if (!(importChange instanceof NoopChange)) {
    const recorder = tree.beginUpdate(filePath);
    recorder.insertLeft(importChange.pos, importChange.toAdd);
    tree.commitUpdate(recorder);
  }
}

But I don't know how to achieve point 2 and 3. What I need is below

// before
const items = ['1', '2'];
// after
const items = ['1', '2', '11'];

// before
export function getComponent(index: typeof PageOrder[number]): {
  question: Type<unknown>;
  answer?: Type<unknown>;
  title: string;
  analyse?: boolean;
} {
  switch (index) {
    case '10':
      return {
        question: Question10Component,
        answer: Answer10Component,
        title: '父子组件',
        analyse: true,
      };
    default:
      throw new Error('The method getComponent() can not find valid components');
  }
}
// after
export function getComponent(index: typeof PageOrder[number]): {
  question: Type<unknown>;
  answer?: Type<unknown>;
  title: string;
  analyse?: boolean;
} {
  switch (index) {
    case '10':
      return {
        question: Question10Component,
        answer: Answer10Component,
        title: '父子组件',
        analyse: true,
      };
    case '11':
      return {
        question: Question11Component,
        answer: Answer11Component,
        title: 'some title',
        analyse: true,
      };
    default:
      throw new Error('The method getComponent() can not find valid components');
  }
}