Call /api/token on behalf of user using API Key

Hi,
Is it possible to call the /api/token endpoint using an Authorization header such as:

Authorization = Token <api key>; userId=<any user id>

and without the payload of:

{
    "identification": "username",
    "password": "password",    
    "remember": "1"
}

So that this token can be stored in a cookie flarum_remember as part of an SSO workflow?

Thanks!