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 projects from Jira Server / Data Centre to Jira Cloud using the Jira Cloud Migration Assistant, the app migration platform will coordinate with Innovalog to automatically move Jira Misc Workflow Extensions (JMWE) data associated with the migrated projects. However, due to fundamental architectural differences between Jira Server / Data Center and Jira Cloud, manual updates might be required to JMWE workflow extensions once on Jira Cloud, especially if you are using Groovy scripts.
While there may be a migration path, the process is manual, which takes time and may be subject to data loss. For specifics, please see https://innovalog.atlassian.net/wiki/spaces/JMWEC/pages/156172382/Migrating+from+JIRA+Server+to+JIRA+Cloud