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Dash-Canvas pre-populating annotations

Hey everyone!
My name is Steven and I am just getting started with dash and dash-canvas. For my application, I want to add some annotations before they are added by the user, I know that plotly.py has some image annotations, but I like the way that with canvas you can rotate the annotations. I have tried updating the json_data associated with the canvas, but that does not add any annotations. I was wondering if anyone else had any experience with this scenario or would have any suggestions?
Thanks so much!