I have below function to return some data to JS side and It’s a Map (However the flutter_inappwebview encodes the map after I return It), I do this by addJavaScriptHandler of flutter_inappwebview, But when I return the data I expect the returned object’s readValue property is a function but It’s not and in JS side the property type is string and I have to use eval of JS to convert this property to function and then use It.

return {
  // Other properties 
  'readValue': '''(async function() {
    var response = await window.myyApp.callHandler('eventName', { 'this': '$uuid' });
    return response;
  })
  ''',
};
}

I am looking for a way to return function in the first place.