Unfortunately, it is not possible to insert information from details into macros. One account can have many records in the detail and the macro can only use one record.
The "Connected objects" list displays only the objects that are present as columns in Contacts\Account.
We already have a task registered for our R&D to implement such functionality in future updates.
Thanks Ryan, I told with SalesUp guys, and they confirm me, specifically what we need is not possible with the app, as they answers me: " The main function of our solution is to use data, taken from details (tables, lists...) to create templates with the help of macros. "