You should be able to make the webserver reverse proxy from https://eliot-jones.com/hntrends to http://localhost:5690, e.g. with nginx [0] and httpd [1]

[0]: https://docs.nginx.com/nginx/admin-guide/web-server/reverse-... [1]: https://httpd.apache.org/docs/2.4/howto/reverse_proxy.html