Please check out pyRevit and the pyRevitBoost extension to edit keynotes collaboratively and much, much more. pyRevit is supported in Revit 2019, Revit 2020, Revit 2021 and others.
Enables real-time collaboration on Revit keynotes using the Atom text editor and Teletype for Atom.
To install the add-in, download the latest zip file under releases.
Extract the contents to your C:\ProgramData\Autodesk\Revit\Addins\2019 folder.
See the teletype-revit-linker repository for subsequent
installation instructions.