how to highlight a specific area on chartjs line chart - chart.js

I am using chartjs to draw a line chart on my application. I have dates onx-axis but as a category scale. Means labels are strings but are dates. On the y-axis i have numeric values. I am changing the chart on some functionality and after change i want to highlight some area of the chart. Is there any way i can highlight an area on the line chart? I have searched but did not find anything.
I want to do this pragmatically like there are some specific dates which i want to highlight so i want to have this type of effect.
Any kind of help would be much appreciated. I am very beginner in charts and javascript stuff.
P.S this is specifically for the line chart not for the doughnut

I use this https://github.com/chartjs/chartjs-plugin-annotation lib to do something like this.check on it. I think this will helpful.

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