Creating airflow variables and connections on MWAA using python requests (aws lambda)

I have a requirement to create airflow variables and connections on Amazon MWAA using a lambda function. Here is my python code to create variables:

r = requests.post(
  mwaa_webserver_hostname,
  headers={
    'Authorization': mwaa_auth_token,
    'Content-Type': 'text/plain'
  },
  data="variables set KEY VALUE"
)

it is working fine for variables. But when I try to get or add a connection in the same way, I'm getting 500 error:

r = requests.post(
  mwaa_webserver_hostname,
  headers={
    'Authorization': mwaa_auth_token,
    'Content-Type': 'text/plain'
  },
  data="connections get <CONN_ID>"
)

500 Server Error: INTERNAL SERVER ERROR for url: https://sjkdhfuweyr.<region>.airflow.amazonaws.com/aws_mwaa/cli

What is missing here? Anything specific about the connection to be created in this approach?