@gbannister So, first, after reviewing my app, the plugin to use is Toolbox, not the one I mentioned above.
I use the List item expression to extract the data from a list, like so:
Then we clicking SEND I set the data source of the list item expression:
and then I save the json text that now contains the email addresses in a state:
and then I call the API (in this case update a google event), passing along the json:
