The ability to export and import QA checker settings was recently released to all our Trados Cloud accounts. For reference, an excerpt from our release notes:
It is now possible to import and export QA check settings, making it easier to transfer complex settings you may have defined in a Project Template and want to re-use in another.
Note: This is not compatible with Studio QA checker settings, the export/import only works from Trados Cloud to Trados Cloud.