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.
...
- Log into your Jira as Admin.
- Go to Administration > Add-ons > Live Fields.
- To add a live fields configuration, click Add Live Fields.
- In the dialog box, fill out the necessary fields:
- Enter the configuration name and description.
- 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.
- Select the necessary projects or project categories to associate with the configuration.
- Since v 4.5.106, you also have to select one or more Application Environments to run the script into. Example: "Jira Core" or "Service Desk Customer Portal".
...