To link Jira Labels to your Test Case you will need to first confirm that Labels have been enabled in your Vansah Jira project settings.
By default Labels for Test Cases will be enabled however you can check this setting in Vansah App project settings.
Go to Vansah > Settings
Under Misc settings you will have options to configure extra settings to be used as part of Vansah.
Select Misc > Labels (Enable Labels for Vansah Test Cases)
Once Labels for Vansah Test Cases have been enabled in your Jira project we can now associate existing Jira workspace Labels against the Test Case.