Boards and Filters

Currently at https://confluence.atlassian.com/cloudkb/how-to-migrate-all-boards-and-filters-with-the-jira-cloud-migration-assistant-jcma-1095774091.html it is mentioned

-->Once all data is migrated, only then enable the two Dark Features
-->Create a dummy project in Jira Server with a single Issue
-->Run a JCMA migration plan only with that dummy project

But for a customer migrating in multi-phases over many months , it's not feasible to 

• Wait for the end of the migration to migrate boards/filters. 
• Migrate all boards and filters at the start will bring over so many incomplete or invalid boards/filters which isn't acceptable either. 

Similarly for dashboards

Currently at https://confluence.atlassian.com/cloudkb/how-to-migrate-all-dashboards-with-the-jira-cloud-migration-assistant-jcma-1103430546.html it is mentioned 

-->DO NOT ENABLE THIS FEATURE FOR EVERY MIGRATION PLAN
-->The recommendation is to migrate dashboards as the last part of the migration, using a dummy project to initiate migration

which again doesn't apply to multi-phase migrations. Especially ones panning over months. 

Goal:

There should be an option to migrate the associated boards, filters and dashboards per plan and for the scope of projects rather than the whole instance.