Data field to pull json data into a datafield ?

I'd love to create or have someone create for me a datafield that pulls it's label and value from a very simple json document at a user specified url.

some as simple as this  

{ "Lake Temp" : 87 }

would enable a datafield of label Lake Temp with value of 87 and have it update at whatever interval.

I see from this format that it was impossible 9 years ago but according to Jim it can be done now with background service.

I would do it myself but I think it could be very useful for many people so maybe one of the masters (Jim) on this forum would take a crack at it ?

thanks.