static AccessTokenRequest ofJsonWebToken(String jsonWebToken) {
        return ofJsonWebToken(jsonWebToken, null, null);
    }
Creates a new {@link AccessTokenRequest} that is used to request an access token using the JSON Web Token
(JWT), as per <a href="https://datatracker.ietf.org/doc/html/rfc7523">RFC 7523</a>.
oauth2/src/main/java/com/linecorp/armeria/client/auth/oauth2/AccessTokenRequest.java