How to set/get PR_SECURITY_FLAGS/PR_MESSAGE_CLASS MAPI properties using Outlook JavaScript or EWS

Question

To develop Outlook web add-ins, is that possible to set/get MAPI properties such as PR_SECURITY_FLAGS/PR_MESSAGE_CLASS in a compose message?

https://learn.microsoft.com/en-us/office/dev/add-ins/outlook/get-and-set-item-data-in-a-compose-form