The simple answer is, it is not possible and ZOS doesn't want addons to directly communicate between different players.
If you still want to do it, you'd have to do it in a similar fashion to how Tamriel Trade Center is sharing its data between players. That would require an external application for uploading and downloading, a server to distribute the data and ui reloads to save and load it. In other words not easy, potentially unsafe for users and "slow" to share data.
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