how can I convert certain UserMB to SharedMB?

Howdy Folks!

So I have a lot of MBs that I'd like to convert to SharedMB. Instead of doing it one by one, what's the format of the xls or text file that it needs to be in for me to feed it to command to convert just those MBs? and what would that command look like?

so this is the command to convert: set-mailbox -Identity mailbox@domain.com -Type Shared

Thanks in advance!