In Flow Designer - how do add people to the watch list

[Jon57]

I am currently working on a new flow where it simply updates the record in the following 2 fields:

Assignment Group = xxxx (i know how to do this part)

Watch List = multiple people (cant seem to get this part to work) 

My question is, how do you list out multiple people on this field. Is it by email, name, etc trying to keep this as low/no code as possible. 

Thank you

[janvi]

Hi

I tried your steps but I'm unable(flow variable step isn't running) to add multiple users and group to watch list and even I tried the code it showing error for look_up_record 

[janvi]

I tried following your steps but unable to add users and groups to watchlist.

Thank you

[Christy Morris]

Question on that PDF - How did you set the flow variables? When I add that logic the dropdown says "select a flow variable to assign it to your data pill" and the dropdown is empty