We are doing something like this:

custom_target(
  name=‘test1’,
  tags=[‘foobar’],
  extra_vars={
   ‘foo’: ‘bar',
   ‘baz’: {
      ‘baz’: ‘faz’,
      'ref': ‘1234’,
      'port': 4567
    }
  },
  dependencies=[
    ‘dep1/foo,
    ‘dep2/bar’
  ]
)