Show custom field only for specific user group

Hi guys,
I'm enjoying every new release and progress on JEM, well done guys . I know there are only limited resources to get things done but I like to add a feature request.

I've tried to create a few user stories for that ordered by priority:

• As an event organizer I like to define internal tasks/ jobs for a specific user group of volunteers so they can sign up for them and I can see which task has been filled by whom.
• As a user with no permissions I don't want to see these internal tasks/ jobs because they don't affect me and this will just distract from the actual event description.
• As a volunteer I like to be able to see all internal tasks/ jobs which are not signed up so I can choose what to do when I'm available.
• As a volunteer I like to be able to see all internal tasks/ jobs which I have added my name to so I have an overview what I'll have to do at which event.

Is that something which would be an idea or is this a clear no go?

The simplest version would be to allow the user defined fields only being visible to a specific user group who can modify the content...
How could this be achieved? Any suggestions are welcome. :whistle:

Best regards

chrisd