Add custom properties to a schema

  Schema.String
    .annotations({
      // add an identifier to the schema
      identifier: "Password",
      // add a title to the schema
      title: "password",
      // add a description to the schema
      description:
        "A password is a string of characters used to verify the identity of a user during the authentication process",
      // add examples to the schema
      examples: ["1Ki77y", "jelly22fi$h"],
      // add documentation to the schema
      documentation: `jsDoc documentation...`
      someCustomKey: 'someCustomValue'
    })