Actions or Organisations: user/organisation(s) relationships

We are using auth0 for authorisation and authentication within our app. The current authorisation model knows nothing about conceptual “organisations” and is purely a list of username - role.

In order to support a model where we derive roles based upon a user being attached to the relationship between two “conceptual organisations” (think supplier and consumer / provider and user) the question stands: can this be modelled in Auth0?
“Organisations” don’t feel quite like the right use-case, so I presume maybe ‘actions’? I think the requirement would be to assign the supplier/consumer relationships elsewhere (CRM, internal DB?) and try to associate the link within Auth0 against which the username then has association and roles?

Thanks in confused advanced, Al.