How can i pass a variable to a static function

Question

I already have a question regarding this here but as the question was too complicated for a simple answer I created a small project just to showcase my problem.

For this project I have two files global_variables.dart and main.dart

under global_variables.dart I just have one variable declared

String? currentFirebaseUser;

Then under my main.dart I have this

// ignore_for_file: deprecated_member_use

import 'dart:isolate';
import 'dart:ui';

import 'package:background_locator/background_locator.dart';
import 'package:background_locator/location_dto.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:static_function_test/global_variables.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  static const String _isolateName = "LocatorIsolate";
  ReceivePort port = ReceivePort();

  @override
  void initState() {
    super.initState();

    IsolateNameServer.registerPortWithName(port.sendPort, _isolateName);
    port.listen((dynamic data) {});
    initPlatformState();
  }

  Future<void> initPlatformState() async {
    _checkLocationPermission;
    await BackgroundLocator.initialize();
  }

  Future<bool> _checkLocationPermission() async {
    var permission = await Permission.location.status;
    if (permission.isDenied) {
      permission = await Permission.location.request();
    }
    if (permission.isGranted) {
      return true;
    } else {
      return false;
    }
  }

  static void backgroundLocationCallBack(LocationDto location) async {
    // ignore: avoid_print
    //I get currentFirebaseUser is null here
    print("from background location+ ${currentFirebaseUser.toString()}");
  }

  void getLocationLiveUpdates() async {
    currentFirebaseUser = 'pannam';
    return await BackgroundLocator.registerLocationUpdate(
      backgroundLocationCallBack,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
          RaisedButton(
            onPressed: getLocationLiveUpdates,
          )
        ]),
      ),
    );
  }
}

I want to somehow pass the variable currentFirebaseUser = 'pannam'; to the function static void backgroundLocationCallBack(LocationDto location) async {} but the print statement in it always returns a null. so the question is how do I pass a variable to a static function from outside.?

PS: I can't modify the static function to add something like static void backgroundLocationCallBack(LocationDto location String id) because it is a part of a plugin hence can't and am unwilling to modify it.

plugins:

  flutter_geofire: ^2.0.1
  background_locator: ^1.6.12
  permission_handler: ^9.2.0