You can make your Jira fields do basically anything at any point of time, just add and set up Live Fields configuration and associate it with a project.

Adding and setting up Live Fields configuration

1. Log into your Jira as Admin.
2. Go to Administration > Add-ons > Live Fields.
3. To add a live fields configuration, click Add Live Fields.
   
   
    
4. In the dialog box, fill out the necessary fields:
   1. Enter the configuration name and description.
   2. Select a SIL™ file for the live fields configuration. This is a SIL script that will be executed on every issue page for the associated projects.
   3. Select the necessary projects or project categories to associate with the configuration.
   4. Since v 4.5.10, you also have to select one or more Application Environments to run the script into. Example: "Jira Core" or "Service Desk Customer Portal".
       
   

You can edit and remove a configuration by clicking the Edit/Delete icon on the Live Fields configuration page.

See also

Live Fields Routines

Live Fields example: hiding information on the UI