Search results by Group is not working

I'm using the Rest API to pull search results from the Community, I wanted to get the results from a specific group,

see the following parameters that I am using.

"Query": "q=my search string"

curl --location --request GET ' 

Please help me to get filtered results.

Thanks in Advance.

curl --location --request GET ''
[edited by: Aravind Eriventy at 2:18 PM (GMT 0) on Thu, Jan 14 2021]