How do you select/display the Speaker that will be the chair/moderator of a Session?

How do you select/display the Speaker that will be the chair/moderator of a Session?

I could very well be missing something but I can't see an option for displaying the Speaker that will be chairing/moderating a Session
There doesn’t appear to be an option for this in the available Session fields
I can can’t find anywhere that would allow me to add or create an additional field for Sessions
What I want is a duplicate of the Speakers field called Chairperson