GET request with a JSON query parameter

I’m testing a GET API call that includes a parameter whose value is a JSON object, e.g. myParameter=

How can I set the value of myParameter so it is treated as a JSON object by the server script? I’ve typed in what Looks like JSON bu I think it’s being treated as plain text.

I’ve seen a couple of posts that mentiuon using the body raw data value for this but I don;t see how to connect the parameter name with whatever I enter as raw data.

Thanks for any help.

Pete