Data overlay on graphic

I have a fixed size graphic. 800 * 600 for example. PNG, JPG or similar. In certain places I would like to display numbers from Node-Red. For example, the value of msg.payload.temperature_C at possition 100 * 200 above the graphic. Can someone help?

Node-red-contrib-image-tools can do this. See the built in examples (CTRL+I --> examples)

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