[Questions]custom traits is not saving in Remote storage manager

I added more traits from the default input traits. but that traits are not saving in the grapesjs JSON metadata.

storageManager: {
              type: 'remote',
              autosave: false,
              autoload: false,
              stepsBeforeSave: 1,
              contentTypeJson: true,
              urlStore: ''http://localhost:8009/template/save"
          }

the above is my storage configuration in grapesjs init function.

the above image shows that I have custom traits called entity and its field after I saved and come back that those traits are not shown even though the name values also not showing in the traits name input box as shown in below images: