How to get values of filters to a variable in Canvas

I have set of filters on the canvas and values of these will be used in an essql query to pick data to a line chart.

| essql query="SELECT .."
| render

But based on some of the selected values in filters, I want to change the essql query to be used to pick the data for chart. So that how can I read the values selected in filters and save them in a variable.

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