Only authorized users with access to Jira (any license) can be granted access to the Catalog section.
Jira administrators have full access by default.
As for custom fields content, the "pure option" (like in Select List) will be visible to anyone who can reach the issue.
Jira Administration → Apps → Teamlead Catalog → Permissions
Here you can define which groups of users will be able to:
- access the Catalog section and browse its content
- create new entries and change the existing ones
- delete entries