The user should be able to create a freehand drawing in order to make some annotations. Check <[draw-freehand](https://openlayers.org/en/latest/examples/draw-freehand.html)> and <[draw-features](https://openlayers.org/en/latest/examples/draw-features.html)>.
The user should be able to create a freehand drawing in order to make some annotations.
Check <draw-freehand> and <draw-features>.