@Override
    void doAddBodyParams0(QueryParamsBuilder formBuilder) {
        formBuilder.add(JWT_ASSERTION, jsonWebToken);
    }
An access token request that uses a JSON Web Token (JWT) as an authorization grant, as per
<a href="https://datatracker.ietf.org/doc/html/rfc7523#section-2.1">[RFC7523], Section 2.1</a>.
oauth2/src/main/java/com/linecorp/armeria/client/auth/oauth2/JsonWebTokenAccessTokenRequest.java