Append or add text to Document Notes?

Sometimes I would like to add text to one, many, or all the document notes in a project, not the documents themselves. Is there a way to do this? Could there be a service for this function?
Cheers!

To add text to ALL/most Document Notes, isn’t that what the Project Notes are for?

I also find the Scratchpad handy for editing notes, like when my beta is telling me things that’ll need changing.