How to create default_target_group for load balancer in python?

listener = awsx.lb.NetworkLoadBalancer("lb",default_target_group=['group',{ 'port' : 80, 'protocol':'TCP'}])

I am trying to re-create typescript example in python

const listener = new awsx.lb.NetworkLoadBalancer('lb')
  .createTargetGroup('group', { port: 80, protocol: 'TCP' })
  .createListener('listener', {
    port: 443,
    protocol: 'TLS',
    // ARN of the Amazon Cert Manager certificate for *.<http://mysite.com|mysite.com>
    certificateArn: certCertificate.arn,
  })