I found a nice way to add the visuals from the BuienAlarm website: www.buienalarm.nl as a Panel Iframe to Home Assistant.
See here: https://github.com/bouwew/HA-BuienAlarm-Panel-Iframe
Or, when using Lovelace an Iframe-card (https://www.home-assistant.io/lovelace/iframe/) can be used.
Please see below, thanks @Mister-Espria!