AccountsTemplates checkbox field

Actually I’m having a minor trouble of generating checkbox in signup form. This is my present code

AccountsTemplates.addFields([
  {
    _id: 'position',
    type: 'select',
    displayName: 'Role',
    select: [
      {
        text: 'Developer',
        value: 'Developer'
      },
      {
        text: 'Designer',
        value: 'Designer'
      },
      {
        text: 'Tester',
        value: 'tester'
      }
    ]
  }
]);

Below shown is my user interface

How to show these options as checkbox values instead of dropdown box, so that the user can select multiple values. I want to store that values as a list in the user’s database. Thanks in advance.

Note : I already referred the offical guide - https://github.com/meteor-useraccounts/core/blob/master/Guide.md. But they didn’t provide example for multiple values. They just showed on how to use checkbox as consent.

AccountsTemplates.addField({
    _id: "mailing_list",
    type: "checkbox",
    displayName: "Subscribe me to mailing List",
});