const SiteClient = require('datocms-client').SiteClient;
const client = new SiteClient('YOUR-API-TOKEN');
const ssoGroupId = '312';
client.ssoGroup.copyRoles(ssoGroupId)
.then((ssoGroup) => {
  console.log(ssoGroup);
})
.catch((error) => {
  console.error(error);
});

> node example.js
{
  "id": "312",
  "name": "Admin",
  "priority": 1,
  "role": "34",
  "users": [
    "312"
  ]
}