{contact.organization_name} token is not listed in dropdown of tokens

Part of testing how to send a Scheduled Reminder for an 'on behalf of' membership.
I think it makes sense to be able to use something like the below so it puts in the Org name regardless of who the Reminder goes to.

Currently

{contact.organization_name} works but is not listed in the tokens dropdown list.

Regarding membership of {contact.organization_name} {contact.current_employer}