Hi @Yuval Nakav , thank you for submitting a question.
The following Microsoft Documentation article describes how to customize the VersionOverrides element in the XML manifest file to create add-in commands in the Outlook ribbon, which I think offers a solution to your question.
Add-in commands for Outlook: https://learn.microsoft.com/office/dev/add-ins/outlook/add-in-commands-for-outlook
Thanks,
Alison