Can you limit the data shown in Public API's?

Starting to use Return data from API workflow to create API’s. When I do, lets say I only want to return a list of 2 fields when there are 10 in the current result.

In some cases I would be returning a limited group from an API call.
In others, from Do a search for lookups in the database.

Is it possible to limit the results shown in these API calls?