Yes. First read this – there is this un-documented expression-language (based on JS) for advanced tag selction based on the @key=val1,val2
form: https://stackoverflow.com/a/67219165/143475
So you should be able to do this:
valuesFor('@jira').isPresent
And even (here s
will be a string, on which you can even do JS regex if you know how):
valuesFor('@jira').isEach(s => s.startsWith('CIS-'))
Would be great to get your confirmation and then this thread itself can help others and we can add it to the docs at some point.