Import Excel and Convert to Json for API POST

Hi All,
I am attempting to import excel files using FilePicker and Excel Pub.Deb dependency.

I have managed to get the filepicker to work and add the excel package to convert to Json.
Unfortunately, when testing it, I return null value when converted.

Basically my goal is to use flutterflow to import data from an excel file to then import it to my supabase table.

If the method I am currently trying to setup is not efficient and have a better solution I would love to know.

I have spent hours and hours with no luck. open to all suggestions.

Thanks in advance.

import 'package:excel/excel.dart';
import 'package:file_picker/file_picker.dart';

Future<dynamic> importExcel() async {
  // import excel and return as json extract as json path
// Importing the excel file

  // Reading the excel file
  var file;
  final bytes = await file.readAsBytes();
  final excel = Excel.decodeBytes(bytes);

  // Extracting the data from the excel file
  final sheet = excel['Sheet1'];
  final rows = sheet.rows;
  final headers = rows.first;
  final data = rows.skip(1).map((row) {
    final rowData = Map.fromIterables(headers, row);
    return rowData;
  }).toList();

  // Converting the data to JSON format
  final jsonData = json.encode(data);

  // Returning the JSON data
  return jsonData;
}