I am trying to convert the following interface to JSDoc

export interface Payload {
    [key: string]: any;
    level?: string;
    code?: number;
}

so by conversion it looks like

/**
 * @typedef Payload
 * @type {Object}
 * @property {string} [level]
 * @property {number} [code]
 */

But how do I add the option to also add any field there? How to convert [key: string]: any;?