As we've found out this already exists:
https://www.wegweiser-kommune.de/statistik/herford-hf+nachhaltigkeit-sdgs+kinderarmut+2018+karte
So we'll rather put our efforts into improvements of the existing map instead of writing a new one.
Draw a map colouring cities by their sustainable goals fulfillment
Data-source: https://sdg-portal.de/de
... by creating a webserver hosting this repository, e.g. via python http.server
cd <this-repository>
python3 -m http.server
Open your browser and type http://localhost:8000/ into the address bar.