How do I password Protect sections of a Ghost Blog?

Developer help
1

I am working on a project that needs to have Password Protected sections for MEMBERS ONLY.
That is, some articles and sections are RESTRICTED to a defined group of members. I don’t want to restrict the entire site, just some sections or even more granular, some articles.
How do I do this in Ghost?
Thanks,
Yousaid

2

You’re looking for this (it’s not available at the moment):

3

Thank you much !!