Word addin - Office js Api

Is it possible via the Office JS API to manipulate the Word document or individual paragraphs so as to make them read-only?

To be clear, I would like to do this:

https://support.microsoft.com/en-us/office/allow-changes-to-parts-of-a-protected-document-187ed01c-8795-43e1-9fd0-c9fca419dadf 

Thanks in advance