Need help to scrape Json from an API

Hi all,
I want to scrape the data concerning a specific item in a very long JSON list.
The data can be accessed here http://field.carriota.com/api/v1/graph

I would like to scrape all the fields related to the number 120 (for instance). And what is a bit more tricky is that the number I am interested in changes. In realtiy, I would like to scrape only the. data regarding the value identified with field/name=“MYNAME”

I am an absolute noob when it comes to JSON formatting, and hope someone can shed some light on that :wink: