with plain Jira, you can't query issues without subtasks.
You can do that with the Scriptrunner plugin or the JQL Tricks Plugin. There may be other plugins also, but I know, that these two plugins have functions for querying issues with / without subtasks.
...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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