Adding text events as annotation

I am storing “events” from my homeconnect’ed oven.
Events are numbers like current temperature, setpoint, seconds elapsed/left.
Or strings like current program, door status, if the oven is running or standby etc.

I store the type in tag1, and either numeric values in “value” or strings in “str”

str: Cooking.Oven.Program.HeatingMode.TopBottomHeating

I can create nice graphs of the temperature.
Is it possible to get the string events as an annotation on the graph?