Contact information can be imported from Apple Contacts. The basic workflow is as follows. You add data fields to your design using the Insert > Address Field command. Each of them is meant to show a particular piece of personal information, such as name or telephone number. Data fields are automatically populated with contact information at printing. In the Print dialog, you can create a so-called print list by selecting multiple contacts. When printing has started, the program puts the contact details of each selected person into the corresponding fields.
You can preview your document with imported information in the print preview.
In the last versions of macOS, the program can access information from Contacts only if the user allows this. You can do this by ticking Swift Publisher in the Privacy tab of the Security & Privacy section in the System Preferences.