I am looking for a way to generate a graph in the background and save it as a PNG or similar image format. I want to be able to request a graph in Telegram and have Node Red send the image of the generated graph back. So there will be no dashboard involved.
I have seen how I can use plotly to generate the file and also save in PNG. I even have a sample flow from the old Google Group but it relies on a ui_template to render the graph and save it which is not good for me.
Converting this example to a standalone js or py is way above my head. Has somebody done something similar before?