how to get the canvas wrapper rows, columns & controls details within the JSON data format?

Hi, Thanks for your plugin. how can i get the dropped controls, rows & columns information like json data while click the save button. Herewith i have attached my code. kindly do the needful?

mounted () {
	this.editor = grapesjs.init({
	  container: '#gjs',
	  plugins: ['gjs-preset-webpage', 'gjs-blocks-basic'],
	  pluginsOpts: {
		'gjs-blocks-basic': {
		  blocks: ['column1', 'column2', 'column3', 'column3-7', 'text', 'link', 'image', 'video', 'map'],
		}
	  },
	  contentTypeJson: true,
	  // canvas: {
	  //   styles: ['https://unpkg.com/element-ui/lib/theme-chalk/index.css'],
	  //   scripts: ['https://unpkg.com/element-ui/lib/index.js']
	  // }
	})
	this.editor.Panels.addButton('options', {
	  id: 'saveBtn',
	  className: 'fa fa-floppy-o',
	  command: 'save-db',
	  attributes: {
		'title': 'Save',
		'data-tooltip-pos': 'bottom',
	  },
	})
	this.editor.Commands.add('save-db', {
	  run: function (editor, sender) {
		editor.store()
		sender && sender.set('active')
		editor.on('storage:store', function (e) {
		  console.log('Stored ', e.components)
		})
		// editor.on('storage:load', function (e) {
		//   console.log('Loaded ', e)
		// })
	  }
	})
	// console.log(storageManager)

	// let storageManager = this.editor.StorageManager
	// storageManager.add('local2', {
	//   store: function (data, clb) {
	//     for (let key in data) {
	//       console.log(key, data[key])
	//     }
	//   }
	// })
  }