Within API workflows, we have the action ‘Data > Return data from API’.
It would be super useful if we could refer to these keys of data within a later workflow e.g. result of step 1 key start-date.
It would essentially allow for local variables to be composed without touching the DB and could even be used as a ‘get data from external API’ to return data and query on parameters.
While it may not be exactly what @luke2 was suggesting, in my “List Popper and Friends” plug-in there are SSAs Flow State and Flow State List that are akin to local variables for server-side workflows.