Area fill based a string field

Hi, noob here.

I’m trying to use grafana (and influxdb) to show data from home assistant. Specifycally I’m drawing a graph of the actual temperature and the target temperature and this is fine.

Now I want to use a string field to change the area fill value so I can see when the heaters are actually on. Sadly I can’t find a way to do it.

I don’t even know the right lexicon to do proper searches.

Can you help me?

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