I don't think permission schemes would be appropriate in this context if I understand correctly as you just want to hide projects that are perhaps older than "X" date or check/uncheck a box that prevents the projects from being shown.
I have not seen this feature implemented and I would advise creating a Suggestion request on JAC and adding your use case to the description. If you do that post the link here so the community can vote on it and add impact!
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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