static fromJSON(...args) {
        return io.fromJSON(...args).then((content) => new DataFrame(content));
    }
Create a DataFrame from a JSON file. It returns a Promise.
@param {String | File} pathOrFile A path to the file (url or local) or a browser File object.
@example
DataFrame.fromJSON('http://myurl/myfile.json').then(df => df.show())
// For browser only
DataFrame.fromJSON(myFile).then(df => df.show())
// From node.js only
DataFrame.fromJSON('/my/absolute/path/myfile.json').then(df => df.show())