EDIT: I did not see the script-lab mention at the end of your comment.

Microsoft Script-lab will allow you to do just that. https://www.microsoft.com/en-us/garage/profiles/script-lab/

The other issue: it is not trivial to share an addin to end users. You need to publish it to marketplace or sharepoint. Sideloading requires SMB server and GPO. However there is an option that is not mentioned anywhere: it is possible to embed it in a document and it will install when it is open for the first time (after user confirmation).