Problem Definition

The new Atlassian App Migration Platform (currently under development) will enable all Atlassian Marketplace Partners apps to build automated migration paths for their apps.

Suggested Solution

When a customer migrates from Jira Server / Data Centre to Jira Cloud using the Jira Cloud Migration Assistant, the app migration platform will coordinate with the Announcer for Jira to automatically move Announcer for Jira data associated.

Workaround
Please see link for instructions