transfer data from flutter to appwrite dart function

I am trying to transfer data from the Front-End (Flutter) to AppWrite function with dart 3.1 runtime
I have previously managed to do it with Node.js, but in Dart it is not working form me.

This is an example of front End Code

Future<Map<String, dynamic>> runFunctionExecution(
) async {
var funcRes = await functions.createExecution(
functionId: FunctionId,
body: jsonEncode({
"headers": "The Headers for test",
"body": "The body for test ",
}),
);

This is the function I am deploying to AppWrite

Future main(final context) async {
context.log(jsonEncode(context.req.body));
context.log(jsonEncode(context.req.payload));
}

It is deploying successfully and log shows the result , but cannot see my data sent from the front-end.

I am definitely missing something in reading the req data
Tried every possible thing I could think of, no luck