Improving The Lasso select
It would be great if we can copy and paste the selected elements by lasso select. Also, there is something I didn't like about the lasso select which is that every time I enable it by the stylus button it stays on and if you want to change it you will have to select the pen or something else manually, and I think it should be off automatically like OneNote and other apps.
GoodNotes for Windows already provides support copy/paste objects. You can refer to this help article for more information: https://support.goodnotes.com/hc/en-us/articles/5898634781071-Using-the-Lasso-Tool
You can indeed copy & paste, just tap inside the selected area you will see the context menu!