@Override
    public void addAsBodyParams(QueryParamsBuilder formBuilder) {
        formBuilder.add(CLIENT_ASSERTION_TYPE, CLIENT_ASSERTION_TYPE_JWT);
        formBuilder.add(CLIENT_ASSERTION, jsonWebToken);
    }
A client authentication method that uses a JSON Web Token (JWT) as the client assertion, as per
<a href="https://datatracker.ietf.org/doc/html/rfc7523#section-2.2">[RFC7523], Section 2.2</a>.
oauth2/src/main/java/com/linecorp/armeria/common/auth/oauth2/JsonWebTokenClientAuthentication.java