Hi Kashyap,
Blue Prism currently does not natively support CSS Selector. If this is still your requirement, you will have to look outside Blue Prism for solutions. This includes but not limited to JavaScript.
That being said "Web Path" attribute available from the Chrome spy mode supports XPath selector. If you are able to write appropriate XPath Selector instead, you would be able to obtain similar outcome.
------------------------------
Bruce Liu
Senior Product Consultant, Professional Services
Blue Prism
Australia/Sydney
------------------------------