Add the ReplyRecipients list to the item context (like before) - In Outlook

You can see the initial post here :

office js - How to change the "ReplyRecipients" in Outlook web Addin? - Stack Overflow

Before in the old Addin format we have the ReplyRecipients collection and we could add / change the "reply to" email address.

Now in the new Api the "From" object is read only and we could not change anything (Office.From interface - Office Add-ins | Microsoft Learn).