[FR] could you please provide a method to export as a markdown format text or file after edit the original markdown|json

[Ray8716397]

Description

import 'package:appflowy_editor/appflowy_editor.dart';

could you please provide a method to export as a markdown format text or file after edit the original markdown|json

Impact

At the moment it's a bit inconvenient to preview the edited markdown somewhere else.

Additional Context

No response