how to make app multi threading loop infinite flutter?

i tried to build flutter multi thread but failed, i want the while loop to run continuously and not stop the ui page,

can flutter be multi thread?

import 'package:flutter/material.dart';

import 'dart:isolate';
import 'dart:async';

void main() async {
  ReceivePort port = ReceivePort();

  await Isolate.spawn((SendPort sendPort) async {
    while (true) {
      // await Future.delayed(Duration.zero);
      sendPort.send("azka");
    }
  }, port.sendPort);

  port.listen((value) {
    print(value);
  });

  runApp(
    MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    ),
  );
}