Each board is having its own ID which is known as a RapidBoard ID in the URL. If you open an existing board and check the URL you should get that, you can then copy paste that URL in a new shortcut in the project sidebar.
Hope this helps!
Related, but think it's speaking to Jira Server, as opposed to Jira cloud. In the comments it's suggested it's not possible with cloud as well.
I tried to find my board ID in this fashion but for all my boards I get the following:
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...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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