You can make your Jira fields do basically anything at any point of time, just and 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 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.
       
   

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

See also

Live Fields