Keep getting CORS when using fake endpoint for remote storage

Hi everyone! I'm using grapesjs with vuejs and I'm struggling with CORS. I created my fake endpoint with beeceptor and I have the code below for editor:

this.editor = grapesjs.init({
      container: '#gjs',
      height: '500px',
      width: '100%',
      plugins: [
        'gjs-preset-webpage'
      ],
      storageManager: {
        id: '',
        type: 'remote',
        storeComponents: true,
        storeStyles: true,
        storeHtml: false,
        storeCss: false,
        contentTypeJson: true,
        stepsBeforeSave: 5,
        urlStore: 'https://supa-god.free.beeceptor.com',
        urlLoad: '',
        params: {
          'Access-Control-Allow-Origin':'http://localhost:8080'
        },
        headers: {
          'Content-Type': 'application/json'
        },
        json_encode: {
          'gjs-components': [],
          'gjs-style': [],
        }
      },
    })

It works just fine if I do normal request like post(url, params).then()... but gives out CORS error when I use this.editor.store(). I noticed that grapesjs includes X-Request-With header in the request and I found that you cannot make cross-domain request with it. Is there any way to make the request go thru with my fake store endpoint?