The following custom field type is provided by catworkx Application Link Picker for Jira:

CWX Application Link Picker Field

A custom field for selecting an application link.

The CWX Application Link Picker Field does not require any configurations.

Appearance of the Application Link Picker Field in edit mode:

Appearance of the Application Link Picker Field in view mode:

On mouse click, the Application Link Picker Field displays a list of the configured application links.