Hi, the DM step only deletes data. There is no default function do delete annotations the same way.
Here is a post on IdeaStream to include such a feature. If you agree, please like to increase awareness:
Copy Annotations Function - OneStream Community (onestreamsoftware.com)
For you, you can write a rule to delete the annotations and use that in a (dynamic) dashboard (if needed). The OneStream support team can also help with this, though this is likely a paid for services (building such a logic).
Here is another loosely related post on copying annotations. You could use this to set the annotation text to nothing instead of using it to copy something:
Solved: Query on annotation data copy - OneStream Community (onestreamsoftware.com)