Simpler JSON Plugin?

I want to use grafana to monitor a 3rd-party.
That third party exposes a REST API that provides me with a JSON containing all the data I need.

But it does not comply with SimpleJSON plugin.

What I need is to call http://some.route/ - and make a chart on it, and define alerts based on it.
I don’t need anything else.

SimpleJSON plugin expects me to be the owner of the backend, but I am not.

I am about to write use amazon gateway and lambdas to overcome this gap.
Is there an easier way? One that aligns to Grafana better?