The new Atlassian App Migration Platform (currently under development) will enable all Atlassian Marketplace Partners apps to build automated migration paths for their apps.
When a customer migrates from Jira Server / Data Center to Jira Cloud using the Cloud Migration Assistant, the app migration platform will coordinate with Enhancer Plugin for Jira (JEP) to automatically move all data associated with the migrated app.
Snapbytes team is currently
-gathering the requirements from the existing on-prem customers for the migration functionality
-doing feasibility of implementing additional features that are only available for Server/Data Center for now
-crafting an app migration plan including to support app-related data/configuration
There is no workaround identified for the purpose of cloud migration.