Sign in into re:Post from a CLI assumed session

Would be great if re:Post team could provide docs for how to sign in from CLI into re:Post with an automatic redirect.

I'm using aws-vault which can assume a role, and create a valid session. And I know the pre-signed AWS console URLs have the redirect capability.

So I think this should be possible?

I just want to execute:

aws-vault login repost

And be taken to this site, with a logged-in session.