Timeline graph with dead zones (intermittent chart)

[TobiasVdb]

I have a timeline graph which may contain dead zones, meaning there was no data received for a certain period. Ideally I wished I could add a point for the deadzone occurence with a NULL value, which then doesn't get displayed on the graph.

Now we use a 0 as value, but that makes the line jump to 0 on the graph, which is not realistic behavior. We're missing data, not receiving 0 values.

Is there another way this is possible?