List all sessions

Hello !
I'm trying to list all sessions data active in order to display a page where the user can consult all members connected to the website. Is that possible ?
I let the default FileHandler Driver. Documentation seems to say that it can be slow... but not so much.
The session interface seems to be exclusively dedicated to the manipulation of a session related to only one specific user[url=https://codeigniter.com/user_guide/libraries/sessions.html#id16][/url].

I try to find some other post discussing this common (?) issue but I didn't find anything except an "alluserdata" function belonging to codeigniter 3.

Thanks !