Thanks for your update.
My main purpose is to get confirm below concerns.
- if i have the manifest xml file already is there any way to add the xml using a command line to my outlook client without add using the GUI my Add-in.
- as a sample the the xml add-in can be added in Excel Application as sideload add-in as mentioned in below link. https://learn.microsoft.com/en-us/office/dev/add-ins/testing/create-a-network-shared-folder-catalog-for-task-pane-and-content-add-ins