How to pass arguments to the cloud web scraper root url?

Hello
I'm evaluating web scraper via the Chrome extension. I've setup a root url that looks something like this:
https://site.com/search?query=abc
and then I scrape the result successfully

But "abc" is something I want to change whenever I re-run the scraper i.e. I want the "query" parameter to be different for every scraping execution (assuming it will eventually run on the cloud service and I would want to activate it ad-hoc via some API)

How do I do that?
Thanks...