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Point your Firebase Flutter SDK at Lark by passing your Lark URL to FirebaseDatabase.instanceFor(). Everything else (listeners, writes, queries) works without changes.

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Setup

Add the Realtime Database plugin to your pubspec.yaml: 
dependencies:
  firebase_core: ^3.0.0
  firebase_database: ^11.0.0
Then run: 
flutter pub get

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Connect to Lark

Pass your Lark URL when getting the database instance: 
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_database/firebase_database.dart';

await Firebase.initializeApp();

// Change this from https://PROJECT_ID.firebaseio.com
final database = FirebaseDatabase.instanceFor(
  app: Firebase.app(),
  databaseURL: 'https://your-lark-project-id.larkdb.net',
);

final ref = database.ref('players/alice');
If your firebase_options.dart (generated by FlutterFire CLI) already has the databaseURL, you can update it there instead and use FirebaseDatabase.instance directly.

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Database routing

If your Firebase app stores many independent data silos under path prefixes (game rooms, workspaces, etc.), see Database routing for options on splitting them into separate Lark databases.