In this doc, it is mentioned that
The following features aren\'t yet supported in the Developer Preview.
... ...
Publishing add-i
Was meaning to reply back to this, but add-ins with custom functions are available to be submitted to the Office Store, as announced here: https://developer.microsoft.com/en-us/office/blogs/office-extensibility-build-2019/
Note: Centralized Deployment is still being deployed through all tenants and that will take a few more weeks to complete.
Your interpretation of that guidance in the documentation is correct. i.e., an add-in that uses custom functions cannot currently be published to the Office Store or via Office 365 centralized deployment.
For information about other ways to publish an add-in, see Deploy and publish your Office Add-in.