Hi @geophile ,
If I understand correctly, you would like to select the email address from the trigger step like you do in your first automation? The problem is, that the automation triggered at specific times is independent of any records in your base. That means that it's normal that you only have the options to use the fields you mentioned above "Actual trigger time", "Expected trigger time", "Next trigger time".
What you need to do if the email address is dynamic (not always the same), is to add a step before the email step where you look for one or multiple records containing the email addresses so that you can fill your findings in the to field.
Does that help? If you give me some more details on what you're trying to achieve, I might be able to help out more.