If you plan to send emails multiple times using these same staff members & assignments, you could make a couple of custom fields that would become lead tokens. However, this will only help speed up the process in the future though....it's not the fastest way if you're just going to send an email like this one time.
You could create a couple of custom fields (maybe called 'Staff Member Name' and 'Staff Member Email'). Then add each staff member's name and email onto the Leads that belong to each staff (using Change Data Value flow steps). Those fields and values would become tokens for use in the emails.
Just something to keep in mind if you need to replicate the same process several more times in the future.