I have multiple teams/vendors with a single storyboard to bring everyone together - I've used colour to show responsibilities between people/teams in some cases; in others I've broken the jobs to be done spine flow in favour of components to show natural team divisions. neither are ideal, they get the job done. this typically happens as an iteration following initial board creation to try to shake down the next steps work, the prioritisation, etc.

maybe there is a way to add this dimension differently?