Invalid JSON exported from graph

I’m now on the enterprise free edition and I’m still having problems to achieve what I want. I see I can manipulate the graph. I can also define rules for the RRDs (Q: how to define a rule specifically for a check?). But I’m still getting the aggregation math applied to the discrete values.

I really like that, but not in this particular case. How can I get rid of it and have my values displayed as discrete, non-aggregated values (for this local check only, of course)?