It's not possible on labels without using an add-on though.
There is a feature request for it here, if you want to vote: https://jira.atlassian.com/browse/JRA-23038
See also: https://answers.atlassian.com/questions/156255 for some suggestions.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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