Adding a Load Balancer Endpoint like AWS's 'public-keys.auth.elb.'

[Maxyme]

Would it be possible (or is there already?) to add an endpoint that replicates this functionality?

https://docs.aws.amazon.com/elasticloadbalancing/latest/application/listener-authenticate-users.html

Basically, in the ALB (Application Load Balancer) flow, a user gets a public key from the public-keys.auth.elb endpoint using the id_token's key_id [kid]:

url = 'https://public-keys.auth.elb.' + region + '.amazonaws.com/' + kid
req = requests.get(url)
pub_key = req.text

In a normal flow with JWKS, using the JWKS endpoint works well (ie.
http://localhost:9229/userpool/.well-known/jwks.json) but it would be nice to have the public key from an endpoint on cognito-local to match AWS's flow with ALBs.

It should be straightforward enough, like using pem = jwkToPem(jwk); and returning the pem from a given endpoint.