How to use the @hpcc-js/marshaller.RoxieService function in @hpcc-js/marshaller

fetch(dsp)
                .then(resp => resp.json())
                .then(json => {
                    const protocol = json.response.LayoutText.__properties.ddlUrl.split("://")[0];
                    const hostname = json.response.LayoutText.__properties.ddlUrl.split(":")[1].slice(2);
                    const port = json.response.LayoutText.__properties.ddlUrl.split(":")[2].split("/")[0];
                    const urlStr = json.response.LayoutText.__properties.ddlUrl + `&Protocol=${protocol}&Hostname=${hostname}&Port=${port}`;
                    this.init(placeholder, urlStr, json.response.LayoutText);
                })
                ;

        } else if (false) {
            //  Lets add some demo datasoures
            const ec = this._dashy.elementContainer();
            const datasources = ec.datasources();
            const publicRoxie = new RoxieService(ec)
                .url("http://52.210.14.156:8002")
                .querySet("roxie")
                .queryID("peopleaccounts")
                ;

            const vmRoxie = new RoxieService(ec)
                .url("http://192.168.3.22:8002")
                .querySet("roxie")
                .queryID("peopleaccounts")
                ;

            for (const datasource of [
                new WUResult(ec)
                    .wu(
                        new WU(ec)
                            .url("http://52.210.14.156:8010")

const urlStr = json.response.LayoutText.__properties.ddlUrl + `&Protocol=${protocol}&Hostname=${hostname}&Port=${port}`;
                    this.init(placeholder, urlStr, json.response.LayoutText);
                })
                ;

        } else if (false) {
            //  Lets add some demo datasoures
            const ec = this._dashy.elementContainer();
            const datasources = ec.datasources();
            const publicRoxie = new RoxieService(ec)
                .url("http://52.210.14.156:8002")
                .querySet("roxie")
                .queryID("peopleaccounts")
                ;

            const vmRoxie = new RoxieService(ec)
                .url("http://192.168.3.22:8002")
                .querySet("roxie")
                .queryID("peopleaccounts")
                ;

            for (const datasource of [
                new WUResult(ec)
                    .wu(
                        new WU(ec)
                            .url("http://52.210.14.156:8010")
                            .wuid("W20180513-082149")
                    )
                    .resultName("Result 1")
                ,
                new LogicalFile(ec)
                    .url("http://52.210.14.156:8010")