You can take screenshot of any web element as Comparing Screenshots of а WebElement describes.
You can check the width and hight of the PNG image taken — you need to write some lines of Groovy script your self.
validation of data displayed by charts with existing tables.
This requirement is stated solemnly, but ambiguous. It does not describe what you can/should do. I would suggest to you to reword this sentence into something executable for you.
If you are interested in the behavior of charting software in detail, it is out of the scope which Katalon Studio can cover. You would want to test the JavaScript functions directly. To accomplish it, you need to look at different approach. Possibly you should look at unit-testing frameworks for JavaScript; e.g. QUnit.