Save data from REST API Response

I'm trying to save the "localId" from a REST API response. I'm currenty using http-request component which i downloaded from the marketplace. Is there any way, by which i can bind the parameter from the json response to a app variable?

I know this could be done with a data resource. But I'm guessing there is a method by which a specific key from the json response can be stored inside an app variable

Any help is highly appreciated!