Heatmap for building drawing

We are planning to have temp and humidity lorawan sensors in all the rooms in our school, this data is then fed into Zabbix which i want to then display in Grafana.

I have a drawing of the room layout of the school and would like to use this for a heat map, i.e each room is either red, amber or blue depending on the current temp.

I can see heatmaps, but nothing that will allow me to have this configuration. Is anyone familiar with any 3rd party plugins?

You might checkout apache echart grafana plugin or the new canvas plugin